Question

A DNA sequence is shown.

AAT - CGA - GGT

Which sequences show the result of a deletion mutation in the DNA? Check all that apply.

CAA - TCG - AGG - T
CAT - CGA - GGT
AAT - CAG - GT
AAT - CGA - GGT
AAT - CGA - GT

Answer 1

The sequences AAT-CAG-GT and AAT-CGA-GT are results of a deletion mutation, as they show one nucleotide less than the original sequence AAT-CGA-GGT.

Step-by-step explanation:

The DNA sequences that result from a deletion mutation would have one or more nucleotide bases missing compared to the original sequence. Given the original sequence AAT-CGA-GGT, potential sequences resulting from a deletion mutation might be shorter such as AAT-CGAG-GT or AAT-CGA-GT. Checking the provided options:

• CAA-TCG-AGG-T: This sequence is not correct since it does not match the original sequence and appears to have an extra addition rather than a deletion.
• CAT-CGA-GGT: This sequence is incorrect as it is the same length as the original sequence and does not represent a deletion.
• AAT-CAG-GT: This sequence shows a possible deletion mutation as it is missing one nucleotide compared to the original sequence.
• AAT-CGA-GGT: This sequence is the same as the original and hence does not show a deletion mutation.
• AAT-CGA-GT: This sequence also shows a possible deletion mutation since it lacks a nucleotide compared to the original sequence.

Therefore, the sequences that show the result of a deletion mutation are:

• AAT-CAG-GT
• AAT-CGA-GT

Answer 2

C AAT - CAG - GT

E AAT - CGA - GT

BOTH show the result of a deletion mutation