Question

question 5 of 26

the model shows an error that can occur during dna replication.

which type of replication error does it represent?

a. substitution
b. insertion
c. inversion
d. deletion

Explanation:

Analyze the template strand

The template DNA strand has the sequence:
A - G - A - C - C - A - [C] - G - A - T - T - C
Notice the extra cytosine nucleotide labeled C in the yellow tab above the main sequence.

Observe replication process

During replication, the complementary nucleotides are paired:

• A pairs with T
• G pairs with C

The extra cytosine C is being added into the newly synthesized strand.

Identify the resulting strand

The resulting DNA strand contains an extra nucleotide:
T - C - T - G - G - T - [A newly inserted nucleotide] - C - T - A - A - G
This represents an addition of a base pair.

Define the mutation type

An addition of one or more nucleotides is an insertion.
Using our understanding of DNA Structure, adding a base is an insertion.

Answer:

• A. Substitution
• B. Insertion (Correct answer)
• C. Inversion
• D. Deletion