Which of the following best describes why mapping is most accurate when genes are close together on a chromosome?
A) Double crossover events yield a result that looks the same as no crossover in a two gene mapping experiment and this throws off the calculations.
B) This is not true; relative distance of two loci on a chromosome has no effect on accuracy of mapping.
C) Double crossover events yield a result that looks the same as one crossover in a two gene mapping experiment and this throws off the calculations.
D) The centromere gets in the way.
E) This is not true; mapping genes is most accurate when genes are far away from each other.
Answer: A
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