An SSLP, which is a genetic locus of short nucleotide repeats, is on the X chrom

Question

An SSLP, which is a genetic locus of short nucleotide repeats, is on the X chromosome and located 2 map units away from the X-linked locus responsible for red-green color blindness. Three alleles of this SSLP locus are known: “4 repeats,” “5 repeats,” and “7 repeats.” A woman with normal color vision, but whose father is color blind, marries a man with normal vision, and they have a son.

Given the SSLP genotypes of the various family members shown above, what is the probability that the couple’s son is color blind?

Possible answers:

Family Member SSLP genotype Family Member SSLP genotype Woman's Father "5 repeats" Woman's Husband "3 repeats" Woman "5 repeats" / "7repeats" Couple's Child "5 repeats"

Explanation / Answer

Color blind is a X linked recessive disease. the probability that the couple’s son is color blind is 98%.

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