Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 5P

The total number of crossovers is five in the A-C region. Since one crossover occurs in the region of A-B, the frequency would be 1/5 or 0.20.

The number of crossovers in the B-C region is four. Therefore the frequency is 4/5 or 0.80.

Since the points A and C are close to the end of the chromosome but are not at the terminal points, crossovers can occur in such places outside the A-C length.

To know the overall frequency of crossovers, we need to know the number of meiocytes in which crossovers occur outside the A-C region.