7. Two children, a boy and a girl, both exhibit a form of red-green color-deficient vision....

7. Two children, a boy and a girl, both exhibit a form of red-green color-deficient vision. This type of red-green color deficient vision is associated with an allele on the X-chromosome (X-linked). The mother has normal vision, but the vision of the father is unknown.

a) Deduce the genotype of the mother and father based on the phenotype of the children?

Expert Solution

Red-green color deficient vision is associated with an allele on the X- chromosome (X-linked).

Consider XC as the recessive allele and X as the wild type allele (normal). Both children are red-green color deficient. Hence the genotype of girl is XCXC and the genotype of the boy is XCY. The mother has normal vision and she must have an XC chromosome which means she is a carrier. So the genotype of the mother is XXC. Girls always get one of their X chromosome from fathers. So the father must have XC allele. Since the father is hemizygous, the genotype of the father must be XCY(Red-green color deficient vision)

gladiator answered 2 years ago

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