Mendelian Genetics

AP Biology· difficulty 2/5

Two parents are carriers (Aa) for cystic fibrosis (CF, recessive). The probability of having an affected child is

A
$0$
B
$1/2$
C
$1/4$
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D
$3/4$

Explanation

Aa \times Aa \to 1 AA : 2 Aa : 1 aa. CF (aa) chance = 1/4.

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