Map Units on a Linkage Map Cannot Be Relied Upon

question 22

Multiple Choice

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.
• E) Linkage map distances are identical between males and females.

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