Red-green color blindness is a recessive, X-linked trait represented as Xc. (Normal color vision is represented as XC.) If a daughter has red-green color blindness, what must the genotypes of her parents be?
What will be an ideal response
The daughter can only have red-green color blindness if she received two copies of Xc chromosomes. Since her father only has one X chromosome, his genotype must be XcY. The other Xc chromosome had to come from her mother. If her mother has normal color vision, the mother's genotype is XCXc. However, if the mother is also color blind, the mother's genotype must be XcXc.
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