Question

A gene sequence reads ATCGAT. which represents a substitution mutation.

A. ATGAT
B. UAGCUA
C. TAGCTA
D. ATGGAT​

Answer 1

D

Step-by-step explanation:

A substitution is where a base is substituted by another base

A. ATGAT - this is not a substitution, the C has been deleted

B. UAGCUA - this is not a substitution, but is the complementary mRNA sequence (you can tell because there are Us instead of Ts)

C. TAGCTA - this is not a substitution, but is the complementary DNA sequence

D. ATGGAT​ - this is a substitution, the C in the original sequence has been replaced (substituted) by a G.