A Mutation That Has No Phenotypic Effect on the Organism

Question

A mutation that has no phenotypic effect on the organism is known as:
A) Neutral mutation
B) Null mutation
C) Isomer mutation
D) Lethal allele
E) All of these

Accepted Answer

A neutral mutation has no effect on the phenotype of the organism. A null mutation is one that completely eliminates the function of a gene and is not necessarily neutral. An isomer mutation is not a commonly used term in genetics. A lethal allele causes death of the organism and is not neutral. Therefore, the best choice is A - neutral mutation.