The presence of a nonmutant gene in one chromosome often masks the effect of a mutant allele for that same gene in its homologous chromosome.

Name: The presence of a nonmutant gene in one chromosome often masks the effect of a mutant allele for that same gene in its homologous chromosome.
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This phenomenon is known as dominance, where the nonmutant allele (dominant allele) is able to produce its protein or enzyme and mask the effect of the mutant allele (recessive allele) in the homologous chromosome.

The Presence of a Nonmutant Gene in One Chromosome Often