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SAT® Subject Test in Biology

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Sex-linked Traits: Colorblindness

SATBIO-TJG385

A woman and man have four children. The man is red-green colorblind, but the woman is not. Which of the following combinations of offspring illustrates the most likely phenotypic outcome possible?

A

1 colorblind son, 1 son with normal color vision, 1 daughter with normal color vision who is not a carrier for colorblindness, and 1 daughter who is a carrier for colorblindness

B

2 sons with normal color vision, and 2 daughters with normal color vision who are carriers for colorblindness

C

2 colorblind sons and 2 colorblind daughters

D

3 daughters with normal color vision, and 1 son with colorblindness

E

2 daughters with colorblindness and 2 sons with colorblindness