What is the probability ...

What is the probability of heterozygous offspring?
A. 25%
B. 50%
C. 0%
D. 100%

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Colorblindness is a sex-linked recessive disorder. If the daughter of a couple is colorblind, what are the two possible genotypes of her mother?

a. X^AX^A and X^AX^a

b. X^AX^Aand X^aX^a

c. X^AX^aand X^aX^a

d. Cannot be determined

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