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

question 1

Multiple Choice

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.

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