Question
4. The current distribution for beetle body size is similar to the currant distribution for body color. A bird
population that preys on beetles arrives in the area. The birds have small beaks and therefore can eat only small
beetles. Which type of natural selection will most likely occur in this situation?
A. disruptive
C. directional toward small body size
B. stabilizing
D. directional toward large body size)
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Answer
C. directional toward small body size. The birds can only eat small beetles, so larger beetles will have a lower chance of survival and reproduction. This will lead to a shift in the population towards smaller body sizes.