point on the graph. This graph illustrates the relationship between average UV l
ID: 194281 • Letter: P
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point on the graph. This graph illustrates the relationship between average UV light intensity (where higher values mean more incident sunlight) and skin color (where lower reflectance values indicate darker skin) Points on the graph are color-coded to indicate the racial category of the populations measured Part B Thinking critically Use the graph to answer the questions. 80 Race category of population Which two statements are supported by the data in the graph? Black Pacific Islander Native American Asian White 60 Human populations can be easily group into races by their similarity in skin color ed Human populations with a skin reflectance above 50 are all classified as white D 40 Different human races can be easily distinguished from each other on the basis of skin reflectance 20 100 200 300 400 Human populations living at a UV light intensity of 300 and above are all classified as black. UV light intensity (no units) Low High Human populations in areas with high UV intensity tend to have darker skin Data from: Jablonski, N. and G. Chaplin, "The evolution of human skin coloration," Journal of Human Evolution,39: 57-106, 2000 Human populations classified in the same race may have quite different skin colors.Explanation / Answer
The downward trend indicates that:
Human populations in areas with high UV intensity tend to have darker skin.
The scattered nature of similarly coloured dots indicates that:
Human populations classified in the same race may have quite different skin colours.
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