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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?

Respuesta :

mathmate
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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