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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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rlaehgns rlaehgns
wrote...
11 years ago
brown mouse + heterozygous black mouse have four offspring. what are the chances all offspring will be brown?
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wrote...
#1
11 years ago
Assuming that the allele for brown coat (b) is recessive, and that the black heterozygous mouse has that allele (as opposed to a recessive allele for some third color), the chances that any particular offspring in that mating will be brown are 50% (because the offspring has a 50% chance of getting the b allele from the black parent, and will certainly get a b allele from the brown parent).

So the chances that all 4 offspring will be brown are 1/2 * 1/2 * 1/2 * 1/2 = 1/16 = 6.25%
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