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MCAT Question A Day - 10/4/14 - Answer!

If, in a very large population, a certain gene possesses only two alleles and 36% of the population is homozygous dominant, what percentage of the population are heterozygotes? '

A.  16%
B.  24%
C.  36%
D.  48%

D is correct. This is an application of the binomial theorem under Hardy Weinberg Equilibrium. p2 2pq + q2 ~ 1 and p + q ~ 1. So, p2 ~ 0.36. p ~ 0.6. q ~ 0.4. 2pq ~ 0.48.

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