In tigers, a recessive allele causes a white tiger absence of fur pigmentation). If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring is expected to be white?

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When two heterozygous tigers are crossed (i.e., Aa × Aa), their offspring will receive one dominant allele (A) and one recessive allele (a) from each parent. The recessive gene will only be expressed phenotypically in offspring that inherit two copies of the recessive allele (aa). Therefore, the expected ratio of offspring with the white fur phenotype is 1:3, or 25%.

In Tigers, a Recessive Allele Causes a White Tiger Absence