In mice, the allele for black fur is dominant to the allele for brown fur.

If a male homozygous black mouse is crossed with a female brown mouse, what percentage of the F2 offspring do you predict will be homozygous?

Question

Biology

Toby Dickson

8 January, 19:31

In mice, the allele for black fur is dominant to the allele for brown fur.

If a male homozygous black mouse is crossed with a female brown mouse, what percentage of the F2 offspring do you predict will be homozygous?

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Answers (1)

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Kellen Wiggins · Answer 1

50%

Explanation:

The allele for black fur (B) is dominant to the allele for brown fur (b).

BB or Bb = black fur bb = brown fur

A male homozygous black mouse (BB) is crossed with a female brown mouse (bb). The male parent only produces B gametes and the female parent only produces b gametes. The F1 offspring will be 100% heterozygous Bb.

The F1 individuals will produce B and b gametes. If we cross the F1 individuals to each other (Bb x Bb), we'll get the following F2 offspring:

25% BB homozygous dominant 50% Bb heterozygous 25% bb homozygous recessive

So 50% of the F2 will be homozygous (BB or bb).

In mice, the allele for black fur is dominant to the allele for brown fur.If a male homozygous black mouse is crossed with a female brown mouse, what percentage of the F2 offspring do you predict will be homozygous?

In mice, the allele for black fur is dominant to the allele for brown fur.

If a male homozygous black mouse is crossed with a female brown mouse, what percentage of the F2 offspring do you predict will be homozygous?