Red-Green Color Blindness Is Inherited as a Sex-Linked Recessive Trait

question 22

Multiple Choice

Red-green color blindness is inherited as a sex-linked recessive trait.The gene is found on the X chromosome.How can a man with normal color vision father a daughter who is red-green color-blind?

• A) The woman with whom he mates is red-green color-blind.
• B) The man is heterozygous for red-green color blindness.
• C) He can't (unless there is a mutation).
• D) The man's mother carries an allele for red-green color blindness, and the expression of the trait skipped a generation.

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