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Title: What are the chances all four offspring of a black heterozygous mouse and a brown mouse will all be brown? Post by: rlaehgns on Sep 26, 2012 brown mouse + heterozygous black mouse have four offspring. what are the chances all offspring will be brown?
Title: What are the chances all four offspring of a black heterozygous mouse and a brown mouse will all be brown? Post by: rkarthik301 on Sep 26, 2012 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% |