## 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. p*

^{2}+ 2pq + q^{2}~ 1 and p + q ~ 1. So, p^{2}~ 0.36. p ~ 0.6. q ~ 0.4. 2pq ~ 0.48.

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