A bacterial cell has been exposed to a powerful mutagen.The first line below is the sequence of the ancestral cell, and the second line is for the descendant cell.Intervening sequences where the ancestral and descendant cells have the identical sequences are represented by dots. Ancestral:...ACT...GCA...CAA...CTG...
Descendant: ...ATT...GTA...CAG...CAG...
There have been _______ transitions and _______ transversions.

Question

Quizplus · Accepted Answer

Transitions are purine to purine (A↔G) or pyrimidine to pyrimidine (C↔T) mutations. Transversions are purine to pyrimidine (A or G to C or T) or pyrimidine to purine mutations. In the given sequences, there are three transitions (C→T, A→G, A→G) and one transversion (C→A).

A Bacterial Cell Has Been Exposed to a Powerful Mutagen