Map units on a linkage map cannot be relied upon to calculate physical distances on a chromosome for which of the following reasons?
A) The frequency of crossing over varies along the length of the chromosome.
B) The relationship between recombination frequency and map units is different in every individual.
C) Physical distances between genes change during the course of the cell cycle.
D) The gene order on the chromosomes is slightly different in every individual.

Question

Quizplus · Accepted Answer

The frequency of crossing over varies along the length of the chromosome, leading to different physical distances between genes. Therefore, map units on a linkage map cannot be relied upon to calculate physical distances on a chromosome.

Map Units on a Linkage Map Cannot Be Relied Upon