Colour vision depends upon the dominant alleles of three genes: the R gene and the G gene are both on the X chromosome,while the B gene is autosomal.Recessive mutations in any of the three genes can cause colour blindness.Suppose a colour-blind man marries a colour-blind woman and all of their offspring have normal vision.What is the genotype of the woman?
A) RRGGbb
B) RRggBB
C) rrGGbb
D) RRggBB or RRGGbb
E) rrGGbb or rrggBB

Question

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The Answer of Colour vision depends upon the dominant alleles of three genes: the R gene and the G gene are both on the X chromosome,while the B gene is autosomal.Recessive mutations in any of the three genes can cause colour blindness.Suppose a colour-blind man marries a colour-blind woman and all of their offspring have normal vision.What is the genotype of the woman?
A) RRGGbb
B) RRggBB
C) rrGGbb
D) RRggBB or RRGGbb
E) rrGGbb or rrggBB

Colour Vision Depends Upon the Dominant Alleles of Three Genes