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n mice, an allele for apricot (a) eyes is recessive to an allele for brown (A) eyes. At an independently assorting locus, an allele for tan (t) coat color is recessive to an allele for black (T) coat color. A mouse that is homozygous for brown eyes and black coat color is crossed with a mouse having apricot eyes and a tan coat. The resulting F1 are intercrossed to produce the F2. What is the probability of an F2 mouse having a black coat and apricot eyes?

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Answer:

The probability of an F2 mouse having a black coat and apricot eyes is 3/16

Explanation:

Allele for apricot eyes (aa) is inherited in the recessive condition. Brown eyes can either be AA or Aa.

Allele for tan colour (tt) is inherited in the recessive condition. Black colour can either be TT or Tt.

Parents           AATT   x    aatt

F1                             AaTt

                 AaTt     x       AaTt

  A-T-     = 9

  A-tt      = 3

  aaT-    = 3

  aatt     = 1

the probability of an F2 mouse having a black coat and apricot eyes is 3/16

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