Question

When DNA replication occurs before meiosis, the original DNA strand CAG CCG TAG is copied into complementary strand GTC ACA GGC ATC. What type of mutation has occurred?

A. deletion
B.insertion
C.inverson
D.translocation

Answer 1

The correct answer is B. Insertion. In this particular insertion there is an insert of three bases. Complementary strands in DNA are the opposite strand, so Adenine is coupled to Thymine and Guanine is coupled to Cytosine. So the complementary sequence (also called the antisense strand) of the original would be GTC GGC ATC, there's an extra 3 bases in there: ACA.

Answer 2

Answer:

B. insertion

Explanation:

It can be observed that nitrogenous bases were added to the codon sequence, this is a characteristic of gene insertion mutations.

Insertion is the addition of base pairs to the DNA sequence.

This type of mutation occurs very common when replicating the DNA intron regions where large repetitive sequences (microsatellite regions) are present.

Insertions may occur due to uneven crossings during meiosis.