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 (rr).

The Gene That Codes for Characteristic X Has Two Alleles