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A woman whose father had color blindness is likely to carry the gene for the condition. If she marries a man with color blindness, what could be the genetic makeup of their offspring?

1. XXC × XCY
2. Carrier female × color blind male
3. Offspring: XXC, XCY, XXC, XY
4. Color carrier daughter and color blind son

Correct answer: Offspring: XXC, XCY, XXC, XY

Solution

Color blindness is X-linked recessive, so a daughter of a color-blind father is likely a carrier. Crossing a carrier female with a color-blind male gives four possible offspring genotypes: two daughters and two sons, with the daughters receiving the father’s affected X and the sons receiving his Y.

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