Mutations That Result in No Gene Product or Totally Nonfunctional

Question

Mutations that result in no gene product or totally nonfunctional gene products are called:
A) Isomers
B) Isoalleles
C) Null alleles
D) Lethal alleles
E) Forward alleles

Accepted Answer

Null alleles are nonfunctional mutations that result in no gene product or a completely nonfunctional gene product. Isomers are compounds with the same molecular formula but different structures. Isoalleles are different versions of the same gene that have minor differences in their DNA sequence. Lethal alleles cause death of an organism at some point in its life cycle. Forward alleles are mutations that produce a novel phenotype not seen in the wild-type form.