Jablonski, N. G., and Chaplin, G. (2010). The answer to why skin color is different for different individuals lies within your DNA. migration is causing a mismatch between biology and the environment. Many biological traits have been shaped by natural. 373 0 obj <> endobj Describe the relationship between folate levels and UV exposure. News articles: A quick summary of the new research from Discover; An overview of the research from NBC News; A video introduction to the evolution of skin color from TED.com Describe The Predicted Effects Of Using A Tanning Booth (which Exposes Skin To UV Light) On The Blood Levels Of These Two Vitamins 22. Start studying evolution of human skin color. Spanning the past 2.6 million years, many thousands of archeological sites … When a population of light skin people moves into far northern regions, natural selection makes their skin dark in only a few generations. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This activity explores the evidence that differences in human skin color are adaptations to varying intensity of UV light, as discussed in the short film The Biology of Skin Color.. h�bbd```b``��A$�GɸDro�5��� ��L��H�7`�?0{�T���`���j���� �6Ylo��� $s�@���. How did this variation arise? 442 0 obj <>stream Skin Color Handout. ���8����g �� 0 It has both positive and negative effects on human, health, as you will learn in this film. 15. Describe the relationship between the UV Index (the colored bar in Figure 1) and latitude (y-axis). Abstract Humans skin is the most visible aspect of the human phenotype. Describe the evidence that human skin pigmentation is subject to natural selection. Learn vocabulary, terms, and more with flashcards, games, and other study tools. endstream endobj startxref Smart News Keeping you current Genetic Study Shows Skin Color Is Only Skin Deep Genes for both light and dark pigmentation have been in the human … Human Skin Color: Evidence for Selection. The Biology of Skin Color In this short video, Penn State University anthropologist Dr. Nina Jablonski walks us through the evidence that the different shades of skin color among human populations arose as adaptations to the intensity of ultraviolet radiation in different parts of the world. To determine whether the variation in human skin color is the result of evolution by natural selection. In Part 1 of this lesson, you’ll discover the particular environmental factor correlated with the, global distribution of skin color variations. Answers will vary depending on the color of the fabric that the students used. questions in each section before proceeding to the next. There are no people who actually have true black, white, red, or yellow skin. Today, the major pieces of evidence for this theory can be broken down into the fossil record, embryology, Transcribed Image Text HUMAN SKIN COLOR: EVIDENCE FOR SELECTION INTRODUCTION Our closest primate relatives have pale skin under dark fur, but human skin comes in a variety of shades from pinkish white to dark brown. Specifically, students learn how patterns in variation for the MC1R gene provide evidence that dark skin is favored in environments that experience intense UV radiation. Running time: 18:58 min. The beginning populations for the second and third generations should include more dots that are of colors similar to the fabric and fewer dots that are of colors that stand out against the fabric. Measures of skin reflectance, a way to quantify skin color by measuring the amount of light it reflects, in people around the world support this idea. Human skin color: Evidence for selection 1) Describe the relationship between the UV Index (the colored bar in Figure 1) and latitude (y-axis) The further away you are from the equator, the less intense the UV rays become. in Human Skin Color ... have different natural skin colors. Skin color differences came about a result of natural selection in different human populations. Whenever a species undergoes selection (from evolution), variations can … In particular, she mentions visible light that you see and ultraviolet (UV) radiation that you can’t, see or feel. Proceedings of the National Academy of Sciences USA. To determine whether the variation in human skin color is the Human skin pigmentation as an adaptation to UV radiation. Use specific data from the graph to support your answer. Skin Color Adaptation. ea�hHpb0h�8G��Ѳw5�� K�6�y�����ɚiM����%_C&���+z31�i�ƣ�.���U�t���AivS&���O�yfTDd� UV radiation has a, shorter wavelength and higher energy than visible light. Course Hero is not sponsored or endorsed by any college or university. Pause when Dr. Nina Jablonski asks the, “Is there a connection between the intensity of UV radiation and skin color?”, In this segment of the film, Dr. Jablonski explains that the sun emits energy over a broad spectrum of, wavelengths. Examine Figure 1 on the next page and answer Human Evolution Revised April 2018 Page 1 of 8. Multiple lines of evidence from human genetics, ... A news brief describing research on the evolution of another human trait — skin color. Many aspects of the evolution of human skin and skin color can be reconstructed … In Parts 2 and 3, you’ll come to understand the specific selective, pressures that have shaped the evolution of the trait. h�b```"F6�B �� The level of UV radiation reaching Earth’s surface can vary depending on. In this film, anthropologist Nina Jablonski walks through the evidence that the different shades of human skin color are evolutionary adaptations to the varying intensity of ultraviolet … Explain how UV radiation impacts folate and vitamin D levels. How did this variation arise? Question: Human Ewolution Red 2018 Mhmi Biointeractive Activity Human Skin Color: Evidence For Selection Student Handout 21. scientists look for patterns revealing an association between different versions of the trait and the environment. Describe how skin color is a compromise between two evolutionary pressures. (In other words, why does UV intensity change with latitude?) 410 0 obj <>/Filter/FlateDecode/ID[<3CF399CD5951F6429FCE036509E61BAE>]/Index[373 70]/Info 372 0 R/Length 156/Prev 630093/Root 374 0 R/Size 443/Type/XRef/W[1 3 1]>>stream Dr. Skin color is a well-recognized adaptive trait and has been studied extensively in humans. Using this video as teacher background knowledge , the supporting materials at the bottom of the page provide data-based activities that students analyze to provide evidence to answer the essential question. endstream endobj 374 0 obj <. Human Evolution Revised April 2018 www.BioInteractive.org Page 5 of 7 Student Handout 14. skin (to protect folate) decreases and selection for lighter skin shades (to enable vitamin D synthesis) increases. Most people are familiar with the DNA that is found within the nucleus of a cell, but by tracing mitochondrial DNA (mtDNA) lines, scientists have been able to figure out when the human ancestors began moving out of Africa into different climates. %%EOF This preview shows page 1 - 3 out of 8 pages. Stabilizing selection is the type of natural selection that human skin color follows. The use of color, incised symbols, decorative objects, and language are part of this capacity for communication. The UV Index is a standardized scale that forecasts the intensity of UV radiation at any given time and location, in the globe; the higher the number, the greater the intensity. Symbolic communication may be linked with information storage. Instead, it makes the peak of the bell curve even higher than what would be considered normal. Evidence of the human capacity for communication using symbols is apparent in the archeological record back to at least 250,000 years old, and probably older. Stone tools and other artifacts offer evidence about how early humans made things, how they lived, interacted with their surroundings, and evolved over time. It is distinguished mainly by its naked appearance, greatly enhanced abilities to dissipate body heat through sweating, and the great range of genetically determined skin colors present within a single species. 2) How do you explain the relationship between the UV Index and latitude? Start studying HHMI: The Biology of Skin Color Video. ��b��m(j�8g~�h`� 0 ��� Is There a Connection Between UV Radiation and Skin Color? • Selection for light-skin gene variants occurred multiple times in different groups around the world. Human skin color is quite variable around the world. Examine Figure 1 on the next page and answer, Please write your answers inside of the boxes (it makes it easier to grade). c) Human societies have been very active in migrating around the planet in recent centuries. The performance expectation explicitly calls out how natural selection leads to evolution and evidence of this can be found in part 1 question 10 of the activity guide, “Based on what you know about skin pigmentation so far, suggest a mechanism by which UV intensity could provide a selective pressure on the evolution of human skin color. In this lesson, you will explore some of the evidence for selection by analyzing data and watching the film, Nina Jablonski. • • Today, human migration does not take generations. %PDF-1.6 %���� Human skin… b) Gloger's Rule is wrong. Then they look for selective pressures that can explain the association. Research on the evolution of skin color in humans was avoided by scientists for many years. ;� ��,> Dj^ ��&�In0yL�1��;������ To explore the factors that control variation in human skin color and the implications of this information for human society. Many biological traits have been shaped by natural selection. So there is a lot of mismatch between skin color and geography. �(F� h ��^����W@8 q�Hb0 to�8� ie �{ՔA�qCW�&>&o�^���'Y2Yް�d������0�*�;۸c��Ù,�_ͳ:&Vs6�M�5�V2��bh�Pd�e��d�����j���� �f�,��0ly��g13�H�0�q�8vg�pL Finally, in Part 4, you’ll investigate how modern human. HUMAN SKIN COLOR: EVIDENCE FOR SELECTION INTRODUCTION Our closest primate relatives have pale skin under dark fur, but human skin comes in a variety of shades from pinkish white to dark brown. Many biological traits have been shaped by natural selection. It ranges from a very dark brown among some Africans, Australian Aborigine s, and Melanesians to a near yellowish pink among some N orth ern Europeans. CopyofHUMANSKINCOLOREVIDENCEFORSELECTION.pdf, Florida International University • PCB 3063L, Inver Hills Community College • ANTH 1130, Corral Lab 13 - Biology of Skin Color .pdf. Human Skin Color: Evidence for Selection Helen Snodgrass describes how she uses BioInteractive's "The Biology of Skin Color" film and "Evidence for Selection" activity to show students how humans have evolved over time. Video from HHMI (18 min 58 sec) that summarizes the scientific explanation for the indigenous distribution of human skin color. Vitamin D And Folate Levels In The Blood Are Both Affected By UV Light. The answer is an evolutionary story that takes us from the milkmaids of the Alps to the Maasai herdsmen of Africa. 107: 8962-8968. Questions 1–6. How did this variation arise? Impressive progress has been made recently to identify genes associated with skin color variation in a wide range of geographical and … selection. Nina Jablonski found by overlaying the maps, where UV intensity was strong, skin was: darker / lighter 8. Please write your answers inside of the boxes (it makes it easier to grade) 1. the time of day, the time of year, latitude, altitude, and weather conditions. human skin color evidence for selection.docx - INTRODUCTION Our closest primate relatives have pale skin under dark fur but human skin comes in a, 3 out of 3 people found this document helpful, Our closest primate relatives have pale skin under dark fur, but human skin comes in a variety of shades from, pinkish white to dark brown. Skin color is worthy of scientific investigation, however, because it is the product of over five million years of evolution in the human lineage, it the most obvious characteristic in which people vary in their appearance, and it is of great social importance. Read the information in Parts 1–4 below, watching segments of the film and pausing as directed. (Wavelengths you feel as heat are in a portion of the spectrum called infrared.) The Biology of Skin Color: Black and White ... A million years of natural selection later, each human has about 2 million sweat glands spread across his or her body. In stabilizing selection, the median phenotype is the one selected for during natural selection. This does not skew the bell curve in any way. The essay should be judged according to how well students use evidence … Watch the film from the beginning to time stamp 5:49 minutes. The pigment eumelanin makes skin darker, which helps protect against harsh sunlight. HHMI BioInteractive | Skin Color Interactive Video: Embedded quiz modules test students’ understanding as they watch a short film that explores the evidence for the evolution of the variation in skin color among human populations.A shorter version of this video that can serve as an engagement piece can be found here.. HHMI BioInteractive | The Biology of Skin Color: …
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