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Genetics and heredity — Question 13

QCAA 2022, Paper 1 · 1 mark

Q13 · 2022 · Paper 1Unclassified1 mark

QUESTION 13

An error during DNA replication resulted in the following change to mRNA transcripts.

mRNA before

AUGAAGUUUGGCAUC ... (continued)

mRNA after

AUGAAGUUUGCAUCG ... (continued)

The DNA replication error most likely involved

(A) deletion of cytosine.

(B) insertion of guanine.

(C) substitution of uracil with guanine.

(D) substitution of guanine with cytosine.

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