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MCAT Question A Day - 9/24/14 - Answer!

Sickle cell anemia is an autosomal recessive disease. male with the disease and a female that is not diseasedbut carries the trait, produce two girls. What is the probability that neither girl carries recessive allele?

A.  0%
B.  25%
C.  50%
D.  66%

A is correct. Both girls must carry the trait because they receive their father's recessive chromosome.

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