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

Question

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The Answer of 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

Color Vision Depends on Dominant Alleles of Three Different Genes