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Skin Color Variation InvestigationBlack , white, yellow, red or various shades of brown? Only the camera knows for sure!
Below: Ethiopian, Cambodian, Sioux, Italian, Finnish, Chinese, Irish
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Human Variation in Skin Color and Race as a Social Construct
• This lesson is part of evolution unit which follows heredity and genetics• The lesson is interdisciplinary in nature in that I discuss the concept of race as a social
construct and the idea that there are “black, white, red, yellow” skinned people is something that people developed. It is not based on biology. Race groupings are human-made groups.
• Students first learn about mixing light and how to determine black and white from an ADI analysis. They learn that red and green = yellow, etc.
• They then photograph each other’s forearms and analyze the images using ADI. • We then discuss skin color as an adaptive advantage.• I reinforce the idea that people’s skin color (before there was sunscreen, folic acid, and
Vitamin D supplements) was an adaptation which enabled people to survive. I point out to the students that they come from a long line of WINNERS (otherwise they wouldn’t be here! )
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What observations can we make from the graphs of RGB values from photos taken of students from
various backgrounds/ethnicities?• The next series of slides shows RGB values and color graphs for 5 of my
students. I have included their photos and their self-described racial/ethnic group. Can you match the graph with the photo? What is the same with all of the graphs? What is different?
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Graph 1
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Graph 2
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Graph 3
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Graph 4
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GRAPH 5
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African –American #1
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Cambodian #2
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Irish, English, German #3
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Ecuadorian, German #4
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Hungarian, Czechoslovakian #5
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Answers
• Photo #1 = graph 4• Photo #2 = graph 5• Photo #3 = graph 1• Photo #4 = graph 2• Photo #5 = graph 3