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16 January, 17:17

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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  1. 16 January, 17:34
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    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).
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