The gene that codes for characteristic X has two alleles. Allele D is dominant, and allele r is recessive. If the father is homozygous for trait X with allele r and the mother is heterozygous for trait X, the chance that one of their offspring will exhibit form r for trait X is _____.

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The father is homozygous recessive (rr), and the mother is heterozygous (Dr). The possible offspring genotypes are Dr and rr, giving a 50% chance of exhibiting the recessive trait.

The Gene That Codes for Characteristic X Has Two Alleles