Extended Response

Colorblindness is a recessive, sex-linked trait. A woman and a man, both with normal vision, have three daughters with normal vision. One of the daughters marries a man with normal vision, and they have a son who is colorblind.

Part A Which parent of the son is the carrier of the trait? Explain your answer.

Part B What is the likelihood that the children of a woman heterozygous for colorblindness and a colorblind man will express the trait? Explain your answer.

Test questions are not necessarily arranged in order of increasing difficulty. If you are unable to answer a question, mark it and move on to another question.

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