A Couple Has a Daughter Who Is Color-Blind

question 73

Multiple Choice

A couple has a daughter who is color-blind. The mother is not color-blind, but the father is. What is the genotype of the mother for this trait?

• A) two dominant alleles
• B) one dominant allele, one recessive allele
• C) three dominant alleles
• D) one abnormal Y chromosome, one normal X chromosome
• E) two recessive alleles

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