B = black

1 answer:

4 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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50% probability of Pp (purple) or pp (white) genotype.

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P = purple gene

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Punnet squares show the possible genotypes and probabilities of each genotype in the offspring of a cross:

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Punnet Square:

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Potential genotypes for offspring are Pp and pp;

According to the Punnett square, 2 of 4 offspring will have the Pp genotype and the other 2 will have pp genotypes;

This means 2 should be purple and 2 white;

Or, there is a 50% chance of having either genotype, of being purple or white.

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