Question

question 28
the most serious type of mutation is a ______ mutation.
a frameshift
b silent
c back
d point

Explanation:

Frameshift mutations (insertions/deletions not in multiples of 3) shift the reading frame of mRNA, altering all subsequent codons and often producing nonfunctional proteins. Silent mutations have no effect on the amino acid sequence. Back mutations reverse previous mutations. Point mutations affect a single nucleotide, which may or may not change an amino acid. Thus, frameshift mutations are the most serious.

Answer:

A. frameshift