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You have a Drosophila line that is homozygous for autosomal recessive alleles a, b, and c, linked in that order. You cross females of this line with males homozygous for the corresponding wild-type alleles. You then cross the F1 heterozygous males with their heterozygous sisters. You obtain the following F2 phenotypes (where letters denote recessive phenotypes and pluses denote wild-type phenotypes): 1364 , 365 a b c, 87 a b , 84 c, 47 a , 44 b c, 5 a c , and 4 b . a. What is the recombinant frequency between a and b? Between b and c? (Remember, there is no crossing over in Drosophila males.) b. What is the coefficient of coincidence?
Sagot :
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