For the computation of chances in the pedigree, the genotype of the parents should be determined first. In this pedigree, the mother of the individual in question is a daughter of an afflicted father. Since this is an X-linked trait, and the daughters are definite recipients of the father's X chromosome, the mother is a definite carrier of the recessive allele.
If a man with full color vision has a child with a woman with a full color vision whose father was red-green color blind (cb), what is the probability that their first child is colorblind?
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