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Evolutionary Biology Exam Study Guide
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BIO305 Exam 2
measurements are taken under the arms near the arm pits, as opposed to the top of the arms or the face, to reduce the potential for environmental effects on skin albedo. At the end of class on 10/18, you were asked the following question: “What do you predict the heritability of human skin color to be? What would it look like on a graph?” a) What would be on your X and your Y axis on this graph? Clearly state how each axis would be labelled. (2 points) b) How would heritability be represented on this graph? Stated another way, what would you have to draw on the graph to show the heritability? (2 points) c) What is your prediction for the estimate of heritability for human skin color? Clearly explain what this value represents and why you made this prediction. You won’t be graded on the accuracy of your estimate, but rather on your explanation of it. (2 points) a) The x-axis would be parent albedo from 0 to 1 versus the y-axis would be offspring albedo from 0 to 1. b) The graph to best represent this heritability would be a scatterplot with a best fit line and the points of intersection would be between offspring and parent so heritability would be the slope of the line. c) My prediction for skin color heritability would be 0.8 which means that genetics plays a role on skin color variation among people as the amount of melanin individuals have vary and the MC1R gene is a important factor in skin color.