Why Do Data on Observable Mutant Phenotypes Underestimate the Actual

Question

Why do data on observable mutant phenotypes underestimate the actual frequency of mutation?
A)Many mutations are in noncoding regions of the genome.
B)Some mutations in protein-coding regions of the genome are synonymous mutations.
C)Most mutations result in death of the individual or an inability to reproduce.

Accepted Answer

A) Mutations in noncoding regions do not necessarily result in observable mutant phenotypes.
B) Synonymous mutations do not always result in significant changes to protein structure or function and may not produce an observable phenotype.