Evolutionary Ecology Question
EmmaLA students did a one-generation selection experiment on Drosophila wing shape. He measured the length (L) and width (W) of 1000 flies, then saved the 100 with the highest L/W ratio for breeding. As he calculated it, the selection gradient imposed on L was 0.8, and on W it was -0.8. From another student’s work, he know the genetic variance in L (when data are standardized) is 0.5, whereas in W it is 0.2. When he measured wings of the offspring generation he discoveedr to his great surprise that not only is L unchanged, instead of decreasing,W increased by 0.24. How would you explain his results?
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