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7 December, 09:57

Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?

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  1. 7 December, 12:09
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    Genotype of Mother: XX°

    Genotype of Father: XY

    Explanation:

    Since the Red-green colour blindness is a recessive trait, it will not be visible in a heterozygous female because dominant allele will mask the recessive allele. Father has only one X chromosome, thus if the trait was present in that X chromosome he must have shown the trait because all the alleles in Y chromosome are recessive. Since the son has inherited the trait it is obvious that he had recieved the trait from his mother who must have been the carrier.
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