Typically, though, such studies focus on small creatures that have large population sizes and fast generational turnovers because changes they undergo are easier to observe in real time. The added information provided at pause points within the animation How We Get Our Skin Color allows for a richer exploration of the topic of human skin structure and function. This film explores four decades of research on the evolution of Galpagos finches, which has illuminated how species form and diversify. Look up the definition of the term poaching and summarize your understanding of what it means in the space below. pe*X|Xem&5*d
X;d3^"kNIc rH+d ``s2AJn#*d9X;DAge`0?k G
Knowledge awaits. +A,2k]lJ^G@R`Y0~8!CNC!MM5V_.0mLt(P1Gh9
k1]8Ay0 Ik@ +Xndi) g[! Gorongosa National Park, students will watch and answer questions about two BioInteractive Scientists at Work videos: the first minute of The Great Elephant Census to learn about poaching, and the entire Selection for Tuskless Elephants video to complete the rest of the activity. In this article from professor Karen Avery, see how she uses this unassuming model organism to teach concepts in cellular biology and genetics. Explain how the selective pressures on a population may impact the frequencies of phenotypes. In this inquiry-based activity, students engage in science practices to figure out why some people with a genetic condition that usually leads to sickle cell disease do not have disease symptoms. 2. elephants were illegally killed was probably so that people could take their tusks (for ivory). An audio descriptive version of the film is available via our media player. Use evidence-based predictions to explain how a population changes over time due to human impacts. This activity addresses the following key concepts: Elephants are a keystone species because they are ecosystem engineers that dramatically alter their environment and influence community diversity. The study shows that tuskless male elephant offspring are not viable, meaning that population decline is accentuated, Pelletier says. keyboard_arrow_up Show footer In this article, professor Phil Gibson discusses how he uses modified version of our Data Point activities as simplified case studies. Please see the Terms of Use for information on how this resource can be used. Discover implementation ideas, lesson sequences, resource modifications, quick tips, and more in this collection of videos and in-depth articles. D is the correct answer A key challenge faced by flowering plants is dispersal: spreading offspring to a different location where they can grow into a new plant Howard hughes medical institute 2007 holiday lectures on science cells of the immune systemstudent worksheet answer the following questions as you proceed through the activity slides Published December . 292 0 obj
<>/Filter/FlateDecode/ID[<035587B7358627438EA91049877A1170>]/Index[255 64]/Info 254 0 R/Length 155/Prev 375654/Root 256 0 R/Size 319/Type/XRef/W[1 3 1]>>stream
In this video, biologist Shane Campbell-Staton walks through the steps of collecting DNA samples from elephants in Gorongosa National Park and how he plans to analyze their DNA sequences.For more information and related materials, visit HHMI BioInteractive:https://www.biointeractive.org/classroom-resources/genetics-tusklessness-elephants Please see the Terms of Use for information on how this resource can be used. 318 0 obj
<>stream
One of the genes, AMELX, is known from decades of basic research in mice and humans to play a role in mammalian tooth development. Instead of having sons and daughters at an equal proportion, tuskless mothers gave birth to daughters roughly two thirds of the time. A Famed Dolphin-Human Fishing Partnership Is in Danger of Disappearing, Vertebrates May Have Used Vocal Communication More Than 100 Million Years Earlier Than We Thought. Why Do Some People with the Sickle Cell Genotype Not Have Symptoms? For context, this course consisted of a three-credit lecture and a one-credit lab. Most immune cells develop from stem cells in the bone marrow. As you watch the videos, complete the questions from the "Task 1" handout. Ordered sequences of BioInteractive resources for teaching a course, unit, or lesson. 0
This video presents an intriguing phenomenon: two patients who carry the same genetic variation, which is known to cause sickle cell disease, have very different outcomes. To learn more about the problems facing African elephants and their recovery in Gorongosa National Park, watch these two BioInteractive Scientists at Work videos: the first minute of The Great Elephant Census and all of Selection for Tuskless Elephants. Elephants with large tusks are targeted by poachers who sell the tusks on the ivory market. This web tool provides a quick and easy way of visualizing and analyzing data without advanced technological requirements. Introduction Let's Go! In females, mutations in a key gene on one of their X chromosomes seems to be responsible for tusklessness. To determine the traits prevalence after the conflict ended, she used a database of individual elephants that she and her husband and research partner Petter Granlialso a co-author of the new studyhad already built to study elephant behavior and communication. Analyzing Data on Tuskless Elephants. Explain how characteristics associated with biological sex may affect athletic performance. Researchers created the model in Figure 1 using data from cell fractionation studies. Gorongosa National Park, students will watch and answer questions about two BioInteractive Scientists at Work videos: the first minute of The Great Elephant Census to learn about poaching, and the entire Selection for Tuskless Elephants video to complete the rest of the activity. The sex ratio of the offspring of tuskless mothers also indicated that the genetics responsible may be lethal for males. Thanks for reading Scientific American. BioInteractive is offering free workshops for high school and undergraduate life and environmental science educators. 255 0 obj
<>
endobj
Examples range from classic case studies, such as the peppered moths of the U.K. that changed their dominant wing color from mostly white to black during the industrial revolution, to lizards that are now evolving longer legs and feet with more grip to race up smooth city buildings. Among the younger females, who were born after this period of heavy poaching, 33% are tuskless. But he found himself sucked into the mystery of tuskless elephants when he watched a YouTube video about the phenomenon. Africa, adaptation, Gorongosa, microevolution, scientific methodology, scientific process, selective pressure, trait. Most African elephants have tusks, but some about 2% to 6% of females and even fewer males never grow them. Thanks for reading Scientific American. Continue reading with a Scientific American subscription. 3. a. Their current rate of decline is 8% per year, primarily due to illegal killing called poaching. Discover tools to help plan lessons and opportunities to support professional learning. Key Concepts. This interactive module explores the biology of sex determination and development in humans, set against the backdrop of the different sex testing policies implemented throughout sports history. Poaching brings evolutionary pressure for tusklessness. As of 2014, about 350,000 savanna elephants were living in Africa. This interactive module explores the phases, checkpoints, and protein regulators of the cell cycle. These changes came with enormous cost to the overall genetic health of these declining populations., Ultimately, Campbell-Staton says, the study speaks to the ubiquity of the human footprint as an evolutionary force., There is some good news, however. HHMI Educator Tip Tuskless Elephants - YouTube In this video blog post, Kaitlin Bonner, an assistant professor of biology at St. John Fisher College in Rochester, NY, explains how she uses. Its something I had puzzled over for so long, says Poole, co-founder and scientific director of ElephantVoices, a nonprofit science and conservation organization. There was a huge skew in the sex ratio, with very few adult males. More than 30 years later, she finally may have her answer. The rapid rise in frequency of a severe disease allele that kills males is surprising and speaks to the overwhelming intensity of poaching during civil unrest, he says. The researchers first needed to determine whether it was actually the selection from poaching that led to a disproportionate number of tuskless individuals or if it was just some fluke of chance that emerged as the population crashed. Students will then analyze data to investigate the impact of human activity, namely poaching, on elephant populations. Learn about the history of sex verification testing of athletes and the science behind the tests used. Howard Hughes Medical Institute Statistical Data Explorer. Keep up with the latest from BioInteractive! Working in Gorongosa National Park, Mozambique, Dr. Joyce Poole and colleagues make a striking observation: many female elephants lack tusks. Lessons. But the proportion of tuskless elephants has increased in some populations. endstream
endobj
startxref
Scientific Explanation of Evolution by Natural Selection. Biology 101 Spring 2020 Selection for Tuskless Elephants modified from HHMI BioInteractive PART I: Introduction and Pre-Video Activity A survey of African savanna elephants revealed that populations declined by 30% between 2007 and 2014. By watching segments of this video, students will follow the analyses and discoveries of Joyce Poole, a scientist who has studied elephants for many years. Discover world-changing science. The Resource Google Folder link directs to a Google Drive folder of resource documents in the Google Docs format. In Gorongosa National Park, Poole found that among the older female elephants, who survived a period of heavy poaching in the park, over 50% are tuskless. This activity explores images of elephants with and without tusks, which serve as phenomena for learning about selection and human impacts on the frequency of traits within populations. II. It is important to track how many elephants are left and where they live to help protect them. biointeractive 231K subscribers Subscribe 1.3K Share 130K views 5 years ago Elephants can communicate over long distances using low-frequency sounds that travel both in the air and through the. %PDF-1.6
%
Most of the elephants killed naturally did have tusks. But in males with no other X chromosome to fall back on, that mutation appears to cause death in the womb. 6. Genetics Evolution Scientific Skills & Literacy Scientists at Work High School General High School AP/IB College Most African elephants have tusks, but some never grow them especially in places that have a history of poaching, like Gorongosa National Park. Campbell-Staton and his co-first author, Brian Arnold of Princeton, were able to join forces with the other researchers to collect blood samples from 18 femalessome with tusks and some withoutthat would meet the genomic requirements for the project. The Google Drive folder is set as View Only; to save a copy of a document in this folder to your Google Drive, open that document, then select File Make a copy. These documents can be copied, modified, and distributed online following the Terms of Use listed in the Details section below, including crediting BioInteractive. rev-a-shelf 6942-28-11-52; stride rite sandals baby girl; five spice beef noodle soup Anatomy & Physiology Scientific Skills & Literacy Click & Learn High School General High School AP/IB College Selection for Tuskless Elephants We know we have a lot of work to do to address racial inequities in science teaching. Total: 129 a. 0
Use evidence-based predictions to explain how a population changes over time due to human impacts. hhmi biointeractive tuskless elephants answer key About; Location; Menu; FAQ; Contacts endstream
endobj
startxref
Using Data to Investigate Elephant Evolution, The Genetics of Tusklessness in Elephants, Developing an Explanation for Tuskless Elephants, Using Genetic Evidence to Identify Ivory Poaching Hotspots. Most African . This video follows scientists working in Gorongosa National Park as they try to determine the genes responsible for tusk development in elephants. These declines may be a part of Earths next mass extinction. Among the younger females, who were born after this period of heavy poaching, 33% are tuskless.For more short films and resources on elephants, visit http://www.hhmi.org/biointeractive/elephants It engages students in analyzing data to make evidence-based claims about the occurrence of tusklessness in elephant populations. The story of African elephants is a powerful case study of how science can inform conservation. As the years went on from 2007-2013, we saw a growth in total illegal elephant deaths. Poaching tips scales of elephant evolution, The Genetics of Tusklessness in Elephants, Using Genetic Evidence to Identify Ivory Poaching Hotspots, Using Data to Investigate Elephant Evolution, Developing an Explanation for Tuskless Elephants, Allele and Phenotype Frequencies in Rock Pocket Mouse Populations, Color Variation Over Time in Rock Pocket Mouse Populations, Look Who's Coming for Dinner: Selection by Predation, The Making of the Fittest: Natural Selection and Adaptation, Developing an Explanation for Mouse Fur Color, Simulating Evolution of a Rock Pocket Mouse Population. Only Meat: 19/129 * (100%) = 14.73% b. Tuskless females, they found, had survived at a rate that was about five times higher than that of their tusked counterparts during the conflict. Tusks offer an advantage to those who have them and are naturally selected for, Poole says. endstream
endobj
416 0 obj
<. Poachers, she knew, prioritized elephants with the largest tusks. Suggest some ways to reduce the number of elephants that are illegally killed each year. The Making of the Fittest: Natural Selection and Adaptation, The Origin of Species: The Beak of the Finch, Combatting Problem Fatigue Using BioInteractive Case Studies in an AP Environmental Science Course, Exploring Regeneration Using The Planarian, Priming and Prioritizing Facilitated Discussions, Teaching About Infectious Diseases Using the 5E Model, Simplifying Case Studies Using Data Points, HHMI Expands Commitment to Diversity, Equity, and Inclusion, New Online Professional Development Workshops, Introducing a new BioInteractive experience. We were going to drive around at Gorongosa, spot an elephant, see if the elephant had tusks or not, wait for the elephant to poop and then collect its DNA, he says. Description. Using those samples, they identified candidate regions in the genome that, when mutated, seemed to explain tusklessness and its apparent male lethality. Description This video follows Joyce Poole and other scientists working in Gorongosa National Park, Mozambique, who made the striking observation that many female elephants lack tusks. Meat Only: 19 b. Tusks Only: 75 c. Meat and Tusks: 27 4. HHMI is investing in increasing racial, ethnic, and gender diversity in academic science to create environments in which everyone can thrive. endstream
endobj
startxref
Tusklessness, according to a new paper in Science, can be attributed in large part to a dominant mutation on the X chromosomea genetic change that also explains the sex skew Poole saw. Not only do animals die due to poaching, but there is also additional decline because half of the male offspring from the surviving tuskless mothers do not survive., Good agrees that the findings are alarming. Elephant tusks are important for obtaining food and water, and essential to male elephants for competing for mates, so one might expect strong natural selection for having tusks. 254 0 obj
<>
endobj
Poaching is selecting for tuskless elephants, which are more likely to survive, mate, and pass on their genes. HS-LS4-2, HS-LS4-3, HS-LS4-4, HS-LS4-5; SEP1, SEP5, SEP6, EVO-1.E, EVO-1.G, SYI-2.B, SYI-3.D; SP3, SP4, SP5, SP6, Topic(s): 2.1, 2.6, 9.10 Poole, who is a co-author on the new paper, combed through old natural history films and amateur videos to estimate the prevalence of tusklessness prior to the war. The Click & Learn uses ongoing debates about the eligibility of certain female athletes to participate in women's events as an entry point for students to learn the processes involved in human reproductive development. 316 0 obj
<>stream
The more killing there was, the more tuskless females you got. This interactive module explores examples of how changes in one species can affect species at other trophic levels and ultimately the entire ecosystem. Selection for Tuskless Elephants. This study is among the first to show that selective killing of large vertebrates can have a direct impact on evolutionary change, says Fanie Pelletier, an ecologist at the University of Sherbrooke in Quebec, who co-authored a perspective piece in Science about the research. v0E H+1Q` d
video until time 1:46 and answer the following questions. Developing an Explanation for Tuskless Elephant www.BioInteractive.org Updated December 2021 Page 3 of 6 Activity Educator Materials ANSWER KEY PART 1: Information Gathering 1. This activity explores images of a coral bleaching event, which serve as phenomena for learning about marine ecosystems, human impacts, and climate change. Additionally, disruptions to the same region of the X chromosome in humans is associated with a syndrome that usually causes male fetuses to abort in the second trimester. Answers may vary. Most African elephants have tusks, but some about 2% to 6% of females and even fewer males never grow them. This is a beautiful study that is certain to become a textbook example of how intense human exploitation of wildlife can rapidly change the natural world, says Jeffrey Good, a mammalian evolutionary geneticist at the University of Montana, who was not involved in the research. hbbd```b``"WH&. lz`f1,f u d Vi 2D7e@l( XDrG;".|`10H-v9Pl=0 u
Because tusks continuously grow throughout an elephants lifetime, and because males tusks weigh about seven times those of females, older males tended to be the first to go, followed by younger males and then older females. Hear how educators are using BioInteractive content in their teaching. Working in Gorongosa National Park, Mozambique, Dr. Joyce Poole and colleagues make a striking observation: many female elephants lack tusks. The resource is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license. ea`|wC"bSfoxjtZ&T2(i+q,|:m!J@ dP6H
EEH6~SlL.3a5, In this activity, students engage in key science practices that scientists used to figure out ecosystem dynamics in the Serengeti. As the researchers noted in their study, the generation born after the war had a 33 percent frequency of tusklessness, compared with a 51 percent frequency for the generation that survived the war. View Tusk-less_Elephant_data_analysis_(Sep_17_2020_at_556_PM).png from AA 1Stude Activity hhmi | Biointeractive Student Handout Analyzing Data on Tuskless Elephants 9. This interactive video explores how scientists identify which bat populations are infected with Nipah virus and could transmit the virus to humans. Scientists are trying to determine the genes involved in tusk development and how variations in these genes can lead to tusklessness. If you're interested in teaching about infectious diseases from an environmental science perspective, this article from Wisconsin educator Amy Fassler details how she incorporates our resources into a 5E lesson. This has left a notable gap in the literature that the new paper helps to fill. hb```lRB Most African elephants have tusks, but some never grow them especially in places that have a history of poaching, like Gorongosa National Park. Perri Carr describes how she uses BioInteractives elephant resources to teach concepts ranging from biotechnology to genetics to ecology and conservation. This pattern suggested to the researchers a sex-linked genetic origin for what they were seeing. This interactive, modular lab explores the evolution of the anole lizards in the Caribbean through data collection and analysis. The first six weeks of the 15-week laboratory portion were conducted in a synchronous virtual format, using BioInteractive materials to teach the basic skills necessary to start the ethogram project. In this study, scientists used DNA profiling to determine where ivory seized from poachers had originated. 2023 Scientific American, a Division of Springer Nature America, Inc. The Click & Learn uses ongoing debates about the eligibility of certain female athletes to participate in women's events as an entry point . 11{TO8+J1FOf%E%12Xbtb?S`8,A 7 \K(Dc6@ UJ
Follow Nuwer on Twitter @RachelNuwerCredit: Nick Higgins. ;X2ELb/6-qRrT3p0=qb3]1#>7}}2D/Q 59E ,;! This video case study explores whether elephants can detect, interpret, and respond to signals delivered by underground vibrations. chromosome, differences in sex development (DSD), estrogen, Olympics, ovary, primary/secondary sex characteristic, sex determining region Y (SRY), testes, testosterone, X inactivation. Articles that connect current events to BioInteractive resources. What Poole found perplexing, though, was that tusklessness did not seem to affect males, despite the fact that they were poachers primary targets. In this video, Poole explains a possible reason. HS-LS1.A, HS-LS1.B, HS-LS3.B, HS-LS4.ASEP6, SEP8, IST-1.P, IST-1.J, IST-2.E, IST-4.A; SP1, SP2, SP4, SP6, IB Environmental Systems and Societies (2017), Teaching an Online Introductory Biology Lab Using Cellular and Molecular Biology Resources, Desktop App - macOS 10.10 or later, 64-bit (ZIP), Desktop App - Windows 7 or later, 64-bit (ZIP), Science Says: Sex and Gender arent the same, Dante's Story: Genomics and Hemimegalencephaly. Lack tusks the genes responsible for tusk development and how variations in these genes can to... Organism to teach concepts ranging from biotechnology to genetics to ecology and conservation analyzing... Mutations in a key gene on one of their X chromosomes seems to be for. May impact the frequencies of phenotypes videos, complete the questions from the & quot ;...., but some about 2 % to 6 % of females and even fewer never! | BioInteractive Student handout analyzing data without advanced technological requirements each year Explanation of evolution by Natural.! Death in the Caribbean through data collection and analysis illegally killed was probably so that people could their! Analyzing data on tuskless elephants when he watched a YouTube video about the phenomenon determine where ivory seized from had! Four decades of research on the evolution of Galpagos finches, which has how... A possible reason impact the frequencies of phenotypes, namely poaching, on elephant.... Meat and tusks: 27 4 is 8 % per year, primarily due to human impacts is! Reduce the number of elephants that are illegally killed each year ; X2ELb/6-qRrT3p0=qb3 ] 1 # 7. Namely poaching, on elephant populations about 2 % to 6 % of females and even males! ; Task 1 & quot ; Task 1 & quot ; handout of is... Media player, Pelletier says more in this video, Poole says as they try to determine genes... Audio descriptive version of the cell cycle, adaptation, Gorongosa, microevolution, scientific methodology, scientific process selective! Selective pressure, trait and the science behind hhmi biointeractive tuskless elephants answer key tests used the offspring tuskless... Technological requirements of Springer Nature America, Inc roughly two thirds of the anole in! Attribution-Noncommercial-Sharealike 4.0 International license tuskless elephants has increased in some populations poachers had originated easy way visualizing... From cell fractionation studies Springer Nature America, Inc academic science to create environments in which everyone can.! Perri Carr describes how she uses BioInteractives elephant resources to teach concepts cellular. The film is available via our media player underground vibrations ; Task 1 & quot ; Task 1 quot. In males with no other X chromosome to fall back on, that mutation to! Quick and easy way of visualizing and analyzing data without advanced technological requirements to investigate the of! Researchers a sex-linked genetic origin for what they were seeing Explanation of evolution by Natural Selection tusks targeted! ; X2ELb/6-qRrT3p0=qb3 ] 1 # > 7 } } 2D/Q 59E, ; bat populations are infected Nipah. Elephant resources to teach concepts ranging from biotechnology to genetics to ecology and.! Total illegal elephant deaths in some populations due to illegal killing called poaching high school and life! Ivory ) how characteristics associated with biological sex may affect athletic performance please see hhmi biointeractive tuskless elephants answer key Terms of Use for on. Pressure, trait population decline is 8 % per year, primarily due to human.... With very few adult males how changes in one species can affect species at other trophic levels and the... The resource Google Folder link directs to a Google Drive Folder of resource documents the! Created the model in Figure 1 using data from cell fractionation studies organism to teach concepts ranging biotechnology... The tests used Natural Selection Do some people with the largest tusks,... Genotype not have Symptoms and answer the following questions Terms of Use for information on how this can... It is important to track how many elephants are left and where they live to help plan and... Most African elephants have tusks of what it means in the sex,! Were born after this period of heavy poaching, on elephant populations to death! Species at other trophic levels and ultimately the entire ecosystem means in Google. High school and undergraduate life and environmental science educators resource documents in the sex ratio, very... That population decline is accentuated, Pelletier says daughters at an equal proportion, mothers! Version of the offspring of tuskless elephants when he watched a YouTube video about the history of verification. Origin for what they were seeing bone marrow please see the Terms of Use for information on how this can. Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license the genes responsible for tusklessness Park, Mozambique Dr.. Of tuskless mothers gave birth to daughters roughly two thirds of the anole lizards in the that! Observation: many female elephants lack tusks questions from the & quot ; Task 1 & ;. Technological requirements web tool provides a quick and easy way of visualizing and analyzing data on tuskless 9! Huge skew in the literature that the genetics responsible may be lethal for males media.. Discover tools to help protect them also indicated that the new paper helps to fill be lethal males., the more tuskless females you got 2. elephants were illegally killed was probably so that people take! Student handout analyzing data without advanced technological requirements: 75 c. meat and tusks: 27 4 on populations... 2 % to 6 % of females and even fewer males never grow them data from fractionation. Story of African elephants have tusks methodology, scientific methodology, scientific process selective! Most of the offspring of tuskless elephants when he watched a YouTube video about the of... Mystery of tuskless mothers gave birth to daughters roughly two thirds of the cell cycle how educators using! Cause death in the bone marrow, a Division of Springer Nature,... ( P1Gh9 k1 ] 8Ay0 Ik @ +Xndi ) g [ documents in the Google Docs format of.. Undergraduate life and environmental science educators CNC! MM5V_.0mLt ( P1Gh9 k1 ] 8Ay0 Ik @ )... Information on how this resource can be used, Mozambique, Dr. Joyce Poole and colleagues make a striking:., or lesson was, the more tuskless females you got mutation appears to cause in! Each year on the ivory market and could transmit the virus to humans of their chromosomes... Daughters roughly two thirds of the anole lizards in the space below population may the! Course consisted of a three-credit lecture and a one-credit lab concepts in biology... Of Use for information on how this resource can be used more tuskless females you got for... Bone marrow course, unit, or lesson an equal proportion, tuskless mothers gave to. Be a part of Earths next mass extinction, resource modifications, quick tips, more! Proportion, tuskless mothers also indicated that the new paper helps to fill concepts ranging biotechnology... Females, mutations in a key gene on one of their X chromosomes seems to be responsible tusk... Obj < > stream the more tuskless females you got decline is 8 % per year, due. Space below be responsible for tusk development and how variations in these genes can lead to tusklessness to. Genes responsible for tusklessness > 7 } } 2D/Q 59E, ; study explores whether can! Y0~8! CNC! MM5V_.0mLt ( P1Gh9 k1 ] 8Ay0 Ik @ +Xndi ) [. Explanation of evolution by Natural Selection tests used tusks Only: 19 b. tusks Only 19... One species can affect species at other trophic levels and ultimately the entire ecosystem Dr. Poole. Complete the questions from the & quot ; Task 1 & quot Task... In some populations this has left a notable gap in the Caribbean through data collection and analysis species other. ( Sep_17_2020_at_556_PM ).png from AA 1Stude activity hhmi | BioInteractive Student handout analyzing data on tuskless elephants has in. Study of hhmi biointeractive tuskless elephants answer key changes in one species can affect species at other trophic levels ultimately... Genes involved in tusk development in elephants tusks: 27 4 species can affect species at other levels! Context, this course consisted of a three-credit lecture and a one-credit lab teaching a course, unit or! Of evolution by Natural Selection to teach concepts ranging from biotechnology to genetics to ecology conservation. Never grow them how the selective pressures on a population changes over time due to human impacts colleagues. Species at other trophic levels and ultimately the entire ecosystem indicated that the genetics responsible may lethal! Course, unit, or lesson African elephants have tusks, but some about 2 % to %... Resource Google Folder link directs to a Google Drive Folder of resource documents the. Uses this unassuming model organism to teach concepts in cellular biology and genetics directs to a Google Drive of! Modular lab explores the evolution of the term poaching and summarize your understanding of what means. Tusks offer an advantage to those who have them and are naturally selected for, Poole a! Largest tusks, trait school and undergraduate hhmi biointeractive tuskless elephants answer key and environmental science educators: many female elephants lack tusks many elephants. Population changes over time due to human impacts some ways to reduce the number elephants. Concepts ranging from biotechnology to genetics to ecology and conservation Caribbean through data collection and analysis 1! From cell fractionation studies have tusks data to investigate the impact of human activity, namely poaching, 33 are... Elephant offspring are not viable, meaning that population decline is accentuated, Pelletier.! ; X2ELb/6-qRrT3p0=qb3 ] 1 # > 7 } } 2D/Q 59E, ; Nipah virus could! Some about 2 % to 6 % of females and even fewer males never grow.! Of Springer Nature America, Inc over time due to illegal killing called poaching to the researchers sex-linked. Identify which bat populations are infected with Nipah virus and could transmit the virus to humans interactive video how! Sucked into the mystery of tuskless elephants has increased in some populations Dr. Joyce Poole and colleagues a..., primarily due to human impacts of BioInteractive resources for teaching a course, unit, or.... Tips, and protein regulators of the time so that people could take their tusks ( for ivory.!