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23 September, 06:22

B = black

b = white

Two rats, both heterozygous for black fur, mate and have offspring. What is the probability that these two rats will have offspring with white fur?

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  1. 23 September, 09:29
    0
    If they are both heterozygous, then they both have alleles Bb.

    Using a Punnett square, we draw the following:

    B b

    B BB Bb

    b bB bb

    Since B is dominant, so only bb will give white fur, i. e. 1 out of four is expected to give white fur.

    Probability is therefore 1/4.
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