In mice, yellow fur is dominant to brown fur, and the Yellow allele is a dominant mutation. Interestingly, mice that have a genotype that is homozygous for the Yellow allele do not survive embryonic development. In this example, what ratio of phenotypes would you expect to see in living offspring from a cross between two yellow mice? It depends on the genotypes of the yellow mice being crossed. 3 yellow: 1 brown All brown All yellow 2 yellow: 1 brown

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