10. In mice, an allele for apricot eyes (a) is recessive to an allele for brown

Question

10. In mice, an allele for apricot eyes (a) is recessive to an allele for brown eyes (a+). An allele for tan coat color (t) is recessive to an allele for black coat color (t+). These characters assort independently (are not linked on the same chromosome). A mouse that is homozygous for brown eyes and black coat is crossed with a mouse having apricot eyes and a tan coat. A. What will be the genotype and phenotype of the F1 generation? B. What will be the probability of the following phenotypes in the F2: brown eyes; apricot eyes; black coat; tan coat? C. In a litter of eight F2 mice, what is the probability that two mice will have apricot eyes and tan coats? (Hint: use binomial expansion.)

Explanation / Answer

A. The genotype of F1 will be a+at+t and the phenotype will be brown eyes and black coat.

B. The probability of the following phenotypes ie: Brown eyes tan coat and apricot eyes black coat will be 3/16, 3/16 respectively.

C. 1/8 x1/8=1/64

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