Question

Which is an example of an insertion mutation that changes all of the amino acids that follow the mutation?

1) CAG - TTC - ACG mutates to CAG - TTA - CAC - G
2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG
3) TAC - CAT - GGC mutates to AAC - CAT - GGC
4) TAC - CAT - GGC mutates to TAC - CAT - GG

Answer 1

it is not number 2 or 3. Me and my friend just took the test and picked different answers. Both 2 and 3 are wrong. pick between 1 and 4.

Answer 2

2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG

Step-by-step explanation:

Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. The number of base pairs inserted can range from one to thousands!

In option no. 1: We see that there is not addition of a single or more than one base, but the new base sequence is different from the original sequence at three places i.e: TTA - CAC - G

In option no. 2: The insertion of three bases ACC has been made exactly after TTC, the whole sequence and arrangement of bases remain same except this insertion.

In option no. 3: The first base of the sequence T is replaced with A, and all other sequence is same. This type of mutation is called substitution in which one base is replaced by other.

In option no. 4: The last base of the sequence C is deleted, and is not present in new sequence. This type of mutation is called deletion in which a base is removed from the sequence.

Conclusion: Therefore, the best option is 2, in which whole codon is inserted in the DNA base sequence.