Melanin is found only in human cells and is not present in other organisms. 4. $("#4Ccheck").text("(Correct) "); //This is text for screen readers Human skin cells contain only one type of melanin. Dec 29, 2015 - Narrated by anthropologist Nina Jablonski, this engaging animation shows how human skin cells produce the pigment melanin, which gives skin its color. if (prefsArray[71+q8cookieOffset] != 0) { document.write(", ")} if (prefsArray[64] != 0) { document.write(", ")} You selected all the correct answers. if (prefsArray[59] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[59])+"");} Today, reaching every student can feel out of reach. Which of the following areas is likely to have the highest amount of UV radiation? ! if (prefsArray[42+q4cookieOffset] == 1 || prefsArray[43+q4cookieOffset] == 1 || prefsArray[44+q4cookieOffset] == 1 || prefsArray[45+q4cookieOffset] == 1 ) { if (prefsArray[37+q3cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[37+q3cookieOffset])+"");} if (prefsArray[23] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[23])+"");} Select another correct answer. if (prefsArray[30] != 0) { document.write(", ")} Cancer. Select another correct answer. C. The pigments will protect DNA in the tomatoâs cells from damage caused by UV light. The Biology of Skin Color. if (prefsArray[21] == 3 || prefsArray[22] == 3 || prefsArray[23] == 3 || prefsArray[24] == 3 ) { Correct! Try again. 6. Based on the risk factors discussed in the film, which of the following groups of people has the highest risk of rickets if they do not take vitamin D supplements? $("#5Ccheck").text("(Correct) "); //This is text for screen readers So, Jablonski did not think that protection against skin cancer explained the selective pressure for darker skin. b) People with dark skin living at higher latitudes (less sunny areas) should B. an area at a high altitude near the equator. if (prefsArray[66] != 0) { document.write(", ")} Populations that get enough vitamin D from their diets would experience less selection for lighter skin. Traits that do not affect offspring production are unlikely to be acted on by natural selection. They’re developing diagnostic testing, understanding the virus’s basic biology, modeling the epidemiology, and developing potential therapies or vaccines. Lighter skin absorbs the UV needed for vitamin D production more easily than darker skin does. if (prefsArray[49] == 3 || prefsArray[50] == 3 || prefsArray[51] == 3 || prefsArray[52] == 3 ) { This correlation has been shown using data on UV radiation collected by the National Aeronautics and Space Administration (NASA) and data on skin colors measured by anthropologists. Pigment cells create caps around the nucleus to: signal cell division / prevent DNA mutations / produce … } C. Variations in human skin color can be quantified, or measured. Try again. if (prefsArray[49] != 0) { document.write(char='0ABCDEF'.charAt(prefsArray[49])+"");} an area at a low altitude that is usually cloudy, an area near the ocean or other large body of water, an area at a longitude in the Western Hemisphere, Human populations around the globe have different versions of the. Select another correct answer. Start studying HHMI: The Biology of Skin Color Video. D. The darker an individualâs skin color, the more likely ultraviolet (UV) radiation will damage the DNA in their cells. A. Melanin is found only in human cells and is not present in other organisms. Select another correct answer. D. On average, the skin color of indigenous peoples around the world correlates with the UV intensity in their environments. if (prefsArray[41+q4cookieOffset] != 0) { document.write(prefsArray[41+q4cookieOffset]-3)}. Skin color in humans is an example of an evolutionary trade-off: a situation where a trait that is an advantage in one context is a disadvantage in a different context. if (prefsArray[45+q4cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[45+q4cookieOffset])+"");} Try again. The Biology of Skin Color. C. an area near the ocean or other large body of water. if (prefsArray[29] != 0) { document.write(", ")} Try again. You selected all the correct answers. Assume that each group spends a lot of time outdoors. Select another correct answer. if (prefsArray[24] != 0) { document.write(", ")} A. adults with dark skin who live close to the equator. Supports K-16 biology and life sciences teaching and features articles related to biology, ethical issues in biology, and teaching strategies. $("#2Acheck").text("(Correct) "); //This is text for screen readers Select another correct answer. Audio. Our records indicate you have visited this interactive video on this device before. So, individuals with larger amounts of eumelanin are favored in high-UV environments. if (prefsArray[30] == 1 ) { document.write("")} Snakes with these mutations move more slowly and may not be as good at hunting or avoiding predators. Some genetic variations that protect humans from malaria, a disease transmitted by mosquitoes, also cause the blood disease thalassemia. You selected all the correct answers. Users who like The Biology Of Skin Color — HHMI BioInteractive Video - YouTube [360p] if (prefsArray[24] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[24])+"");} if (prefsArray[43+q4cookieOffset] == 1 || prefsArray[43+q4cookieOffset] == 2 || prefsArray[43+q4cookieOffset] == 3 || prefsArray[43+q4cookieOffset] == 4 ) { document.write("")} if (prefsArray[38+q3cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[38+q3cookieOffset])+"");} if (prefsArray[70+q8cookieOffset] == 1 || prefsArray[71+q8cookieOffset] == 1 || prefsArray[72+q8cookieOffset] == 1 || prefsArray[73+q8cookieOffset] == 1 ) { if (prefsArray[64] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[64])+"");} Even some bacteria produce melanin. D. children with dark skin who live far north of the equator. if (prefsArray[73+q8cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[73+q8cookieOffset])+"");} But this observation did not directly help Jablonski determine a selective pressure for darker skin. if (prefsArray[72+q8cookieOffset] == 2 ) { document.write("")} Select another correct answer. The Biology of Skin Color — HHMI BioInteractive Video Descrizione: Penn State University anthropologist Dr. Nina Jablonski explains how different shades of skin color arose as adaptations to the intensity of ultraviolet radiation in different parts of the world. if (prefsArray[31] != 0) { document.write(", ")} $("#3Bcheck").text("(Correct) "); //This is text for screen readers Many animals have melanin in their skin, hair, or feathers. Answers chosen: $("#4B").addClass('text-success font-weight-bold'); Which of the following statements about melanin is most accurate? $("#8Bcheck").text("(Correct) "); //This is text for screen readers This observation led Jablonski to propose that the ability to maintain high levels of circulating folate, a nutrient important for human reproduction, provides a selective advantage to individuals living in a high-UV environment. In HHMI's newest video, Dr. Nina Jablonski, a Penn State biological anthropologist and author of Living Color: The Biological and Social Meaning of Skin Color, takes viewers along on her quest to solve the mystery of skin color.The journey begins with an explanation of melanin, which comes in two forms: reddish-yellow (i.e., pheomelanin) and black and brown (i.e., eumelanin). Nina Jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. The Biology of Skin Color Contributor HHMI - Biointeractive Type Category Instructional Materials Types Lesson/Lesson Plan, Activity, Data Note This resource, vetted by NSTA curators, is provided to teachers along with suggested modifications to … This example does not describe a trade-off because it does not mention any disadvantages. Select another correct answer. }, Attempts: Software. This one is called The Biology of Skin Color, and it is another winner.It is narrated by Nina Jablonski, who did much of the research cited in the video. A. if (prefsArray[69+q8cookieOffset] != 0) { document.write(prefsArray[69+q8cookieOffset]-2)}. So, this area would likely have a high amount of UV radiation. If you need to review, click to replay the preceding video segment before answering the question. Name: Elizabeth Accimeus HHMI: The Biology of Skin Color (Video at ) 1. if (prefsArray[20] != 0) { document.write(prefsArray[20])}. HHMI - Biology of Skin Color: HHMI Biology of Skin Color... and for a little social message about DNA and race... PBS VIDEOS PBS EVOLUTION website. if (prefsArray[66] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[66])+"");} But when it comes to hunting fast-moving prey or avoiding predators, having these mutations is a disadvantage. Human skin color variation is mostly determined by the types and amounts of melanin present in the skin. Answers chosen: True / False (circle) 2. if (prefsArray[71+q8cookieOffset] == 2 ) { document.write("")} So, the average skin color overall will not always âmatchâ the UV intensity in an environment.) Correct! The amounts of each type vary from person to person. You selected all the correct answers. This statement is inaccurate. Correct! Try again. A. 10. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The pigments absorb red light and reflect blue and green light. if (prefsArray[35+q3cookieOffset] == 2 || prefsArray[36+q3cookieOffset] == 2 || prefsArray[37+q3cookieOffset] == 2 || prefsArray[38+q3cookieOffset] == 2 ) { $("#6C").addClass('text-success font-weight-bold'); An illustration of a 3.5" floppy disk. Melanin 3. Human populations around the globe have different versions of the MC1R gene. Based on the film, which of the following statements best describes the pigments in a red tomato? Ans.1) The Hypotheses presented in the film to postulates the natural selection and are given below - Absorption and reflection of sunlight - The color we see is due to the reflection of particula view the full answer A. an area at a low altitude that is usually cloudy. The Biology Of Skin Color — HHMI BioInteractive Video - YouTube [360p] by Karen Keifer-Boyd published on 2015-10-27T04:14:36Z. Try again. if (prefsArray[42+q4cookieOffset] == 2 || prefsArray[43+q4cookieOffset] == 2 || prefsArray[44+q4cookieOffset] == 2 || prefsArray[45+q4cookieOffset] == 2 ) { if (prefsArray[28] == 1 ) { document.write("")} }, Attempts: if (prefsArray[58] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[58])+"");} Try again. The Biology of Skin Color — HHMI BioInteractive Video By dratef.net At April 19, 2020 0 Share on Facebook Share on Twitter But skin cancer usually occurs after a personâs peak reproductive years and is unlikely to affect offspring production. On which of the following observations did she base this hypothesis? }, Attempts: $("#8A").addClass('text-success font-weight-bold'); if (prefsArray[65] == 4 ) { document.write("")} Answers chosen: if (prefsArray[72+q8cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[72+q8cookieOffset])+"");} if (prefsArray[42+q4cookieOffset] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[42+q4cookieOffset])+"");} Saved from hhmi.org. UV radiation is most intense at the equator, so people living there have a lower risk of vitamin D deficiency and rickets than people living far from the equator. $("#8D").addClass('text-success font-weight-bold'); if (prefsArray[31] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[31])+"");} What pigment absorbs UV light? Alleles that caused the loss of body hair allowed humans to lose heat more easily in hot environments. $("#6Ccheck").text("(Correct) "); //This is text for screen readers D. The melanin in darkly pigmented skin protects DNA from UV radiation, which can cause skin cancer. if (prefsArray[65] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[65])+"");} if (prefsArray[70+q8cookieOffset] == 2 ) { document.write("")} $("#4C").addClass('text-success font-weight-bold'); if (prefsArray[56] == 3 ) { document.write("")} Saved from hhmi.org. if (prefsArray[37+q3cookieOffset] != 0) { document.write(", ")} if (prefsArray[22] == 3 ) { document.write("")} You selected all the correct answers. Answers chosen: The plantâs leaves, stems, and roots are not red, so they probably contain more pigments that absorb red light and reflect other colors. Try again. Try again. In general, people with more darkly pigmented skin have less folate, a nutrient important for human reproduction, circulating in their blood. Correct! You selected all the correct answers. }, Attempts: This statement is generally true, but it does not provide evidence for the selective pressure in the hypothesis. $("#4D").addClass('text-success font-weight-bold'); In general, people with more darkly pigmented skin have less folate, a nutrient important for human reproduction, circulating in their blood. if (prefsArray[63] == 4 || prefsArray[64] == 4 || prefsArray[65] == 4 || prefsArray[66] == 4 ) { Select another correct answer. if (prefsArray[70+q8cookieOffset] == 4 || prefsArray[71+q8cookieOffset] == 4 || prefsArray[72+q8cookieOffset] == 4 || prefsArray[73+q8cookieOffset] == 4 ) { if (prefsArray[28] != 0) { document.write(char='0ABCDE'.charAt(prefsArray[28])+"");}
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