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 ________ to its normal allele.

A) epistatic
B) auxotrophic
C) recessive
D) dominant
E) gain of function


Answer: C

Biology & Microbiology

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