Assume that a mutation occurs in the gene responsible for the production of hexosaminidase A,such that only about 50% of the enzyme activity is found in the heterozygote compared with a homozygous normal individual.If heterozygotes are phenotypically normal,we would say that the mutant allele is recessive to its normal allele.

Question

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Heterozygotes showing a normal phenotype despite having reduced enzyme activity indicates that the normal allele can compensate for the mutant allele, which is a characteristic of recessive inheritance.

Assume That a Mutation Occurs in the Gene Responsible for the Production