Question

As a result of a mutation, the DNA sequence AGT - TGA - CAT changes to AAT - TGA - CAT.

Answer 1

Answer:

What best describes the mutation in the DNA strand is a substitution in which the DNA base "G" was replaced with a different DNA base "A".

Explanation:

The substitution of a nucleotide - as in this case the change of guanine for adenine - implies a change in the original sequence of nucleotides and corresponds to a type of genetic mutation called punctual mutation.

This type of mutation may or may not have effects on the synthesis of specific protein that the DNA encodes.

The other options are not valid because:

• The substitution that occurs is of a single nucleotide, not three.
• Deletions occur with the loss of one or several nucleotides in the chain, and this case illustrates a substitution.

Answer 2

Answer:

first one

Explanation:

got it right on test ;p