Consider two linked autosomal genes. The dominant allele C
of the first gene causes cataracts of the eye, whereas its
recessive allele produces normal eyes. The dominant allele
P causes polydactyly (an extra finger) whereas its allele
(p) produces a normal number of fingers. A man with
cataracts and normal fingers marries a woman with
polydactyly and normal eyes. Their son has both polydactyly
and cataracts and he marries a woman with neither trait.
What is the probability that their first child will have
cataracts and polydactyly?
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