Which of the following reasons explains why map units on a chromosome linkage map are not reliable measures of physical distances?
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, affecting the reliability of map units as measures of physical distances. Map units are based on recombination frequencies, which can differ in various regions of the chromosome, making them an imperfect measure of actual physical distances.

Which of the Following Reasons Explains Why Map Units on a Chromosome