Select the correct explanation for the fact that a carrier of a recessive genetic disorder does not have the disorder.

Question

The dominant allele for the gene determining the disorder represses protein production from the recessive allele.
Affected individuals have recessive mutations, but a carrier has a dominant mutation.
In a recessive disorder, only a single functioning allele is necessary to determine a normal phenotype.

Answer 1

The correct explanation for the fact that a carrier of a recessive genetic disorder does not have the disorder is:

In a recessive disorder, only a single functioning allele is necessary to determine a normal phenotype.

This means that a carrier possesses one normal (dominant) allele and one mutated (recessive) allele. The presence of the normal allele is sufficient to prevent the expression of the disorder.