The Distance Between Two Points on the Genetic Map of a Chromosome

Question

The distance between two points on the genetic map of a chromosome is equal to:
A) The average number of crossovers between them
B) The exact number of crossovers between them as measured in one cell
C) The estimated number of crossovers between them as measured in one cell
D) None of these
E) All of these

Accepted Answer

The distance between two points on the genetic map of a chromosome is measured in terms of recombination frequency, which is related to the average number of crossovers between them. This is because genetic mapping is based on the probability of crossover events occurring between two loci, which is statistically determined over many cells, rather than the exact number of crossovers in a single cell.