#316 A brown male mouse is mated with

A brown male mouse is mated with - Biology

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Free Chegg Question

A brown male mouse is mated with two female black mice. In several litters of young, the first female has had 48 black and the second female has had 14 black and 11 brown young. Can you deduce the pattern of inheritance of coat color and the genotypes of the parents?

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Free Chegg Answer

1. Step 1 of 2

   Brown male mouse is mated with two female black mice. The first female has 48 black mice while the second female has 14 black and 11 brown young.

   From the above result it can be deduced that: the gene for black coat is dominant (B) while the gene for brown coat is recessive (b).

   In the first case, both the parents are homozygous.

   Genotype of brown male is: b/b

   Genotype of black female mouse is: B/B

   The cross with first female:

    

   b/b x B/B

   

   F1 generation: B/b or all the young in the litter are black.

2. Step 2 of 2

   In the second cross between brown male mouse (b/b) and second black female mouse (B/b) the female is heterozygous.

   The cross with second female mice is:

   b/b x B/b

   

   So in F1 generation nearly half of the young are brown and the other half are black.