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MCAT Question A Day - 9/23/14 - Answer!

What fraction of offspring are likely to display both dominant phenotypes in a dihybrid cross?

A.  1/16
B.  3/16
C.  9/16
D.  15/16

C is correct. From the dihybrid cross Punnett square we have the phenotype ratio 9:3:3:1. Thus, 9 of 16 individuals display both dominant phenotypes.

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