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MCAT Question A Day - 9/29/14 - Answer!

Which of the following would least likely disrupt the Hardy-Weinberg equilibrium?

A.  emigration of part of a population
B.  a predator that selectively takes the old and sick
C.  a massive flood killing 15% of a large homogeneous population
D.  exposure of the entire population to intense radiation

C is correct. Catastrophic events will not cause significant genetic drift to a large homogeneous (well mixed) population. Emigration, selection, and mutation all affect the HW equilibrium.

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