In mice, black fur (B) is dominant over brown fur (b). Breeding a brown mouse and...

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In mice, black fur (B) is dominant over brown fur (b). Breeding a brown mouse and...

In mice, black fur (B) is dominant over brown fur (b). Breeding a brown mouse

and a homozygous black mouse produces all black offspring.

a. What is the genotype of the gametes produced by the brown-furred parent?

________________________________________________________

b. What is the genotype of the brown-furred parent?

________________________________________________________

c. What is the genotype of the black furred parent?

________________________________________________________

d. What is the genotype of the black-furred offspring?

By convention, P stands for the parental generation. The offspring are called the "first filial generation," abbreviated F1. If these F1 offspring are crossed, their offspring are called the "second filial generation," designated F2. Note the following diagram.

P X P and F1 X F1

F1 F2

e. If two of the F1 mice are bred with one another, what will be the genotypic and phenotypic ratios of the F2?

Genotypic Ratio: _______________________________________

Phenotypic Ratio: _______________________________________

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