Sometimes, chemical damage to DNA can occur just before DNA replication begins, not giving the repair system enough time to correct the error before the DNA is duplicated.This gives rise to mutation.If the cytosine in the sequence TCAT is deaminated and not repaired, which of the following is the point mutation you would observe after this segment has undergone two rounds of DNA replication?

Question

Quizplus · Accepted Answer

Deamination of cytosine converts it to uracil, which pairs with adenine during DNA replication. After one round of replication, the original strand with uracil (U) will produce a complementary strand with adenine (A) opposite the uracil. In the subsequent round of replication, the strand with adenine (A) will produce a complementary strand with thymine (T) opposite the adenine, resulting in the sequence TTAT.

Sometimes, Chemical Damage to DNA Can Occur Just Before DNA