Which Situation Most Likely Describes a Recessive Genetic Disorder

Multiple Choice

Which situation most likely describes a recessive genetic disorder?

A) The mutant allele of the gene encodes a completely nonfunctional protein.
B) The mutant allele of the gene encodes a protein that has both the normal function and a new, harmful function.
C) The mutant allele of the gene encodes a protein that has a new, harmful function.
D) The mutant allele of the gene encodes a protein with the normal function but twice the normal activity.