Color Vision Depends on Dominant Alleles of Three Different Genes

question 49

Multiple Choice

Color vision depends on dominant alleles of three different genes: the R gene and the G gene, both on the X chromosome, and the B gene, which is autosomal.Recessive mutant alleles of any one of these three genes can cause color blindness in homozygotes.Suppose a color-blind man marries a color-blind woman and all their offspring have normal vision.What is the genotype of the woman?

• A)RR GG bb
• B)RR gg BB
• C)rr GG bb
• D)RR gg BB or RR GG bb
• E)rr GG bb or rr gg BB

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