A Mutation Creates a Dominant Negative Allele of a Particular

Multiple Choice

A mutation creates a dominant negative allele of a particular gene.The gene encodes a protein that forms a trimer within the cell.If one or more of the subunits has the mutant structure, the entire trimeric protein is inactive.In a heterozygous cell, if the proteins of both alleles are present at the same levels, what percent of the trimers present in the cell will be active?

A) 100%
B) 87.5%
C) 50%
D) 33%
E) 12.5%