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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In sesame, the one-pod condition (P) is dominant to the three-pod condition (p), and normal leaf (L) is dominant over wrinkled leaf (l). The two characters are inherited independently. Determine the genotypes and phenotypes of the two plants which produce the following progeny: 318 one- pod normal, 98 one-pod wrinkled, 323 three-pod normal and 104 three-pod wrinkled.
Cystic fibrosis (CF) occurs with a frequency of about 1/2500 Caucasian newborns and is inherited as an autosomal recessive. A woman had an older sister die from complications of this disease. CF is not present among relatives of her husband. Both the woman and her husband have normal phenotypes. What is the chance this couple will have a CF child?
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