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MCAT Question A Day - 9/28/14 - Answer!

If a certain gene possesses only two alleles. and the dominant allele represents 90% of the gene pool. how many individuals display the recessive phenotype.

A.  0%
B.  1%
C.  18%
D.  10%

B is correct. First you must recognize that 10% of the gene pool is represented by the recessive allele. Then you must realize that only the homozygous recessives display the recessive phenotype. Now use the binomial theorem to see that homozygous recessives are represented by (0.1)2 of the population.

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