The chromosomes maps are not accurate maps because
(1) Crossing over frequency is higher than recombination frequency
(2) One crossing over interferes and increases the frequency of nearby crossing over
(3) Crossing over frequency decreases towards the ends of chromosome
(4) Heterochromation increases crossing over

Dear student.

The correct answer is 2. One crossing over interferes and increases the frequency of nearby crossing over.

As recombination frequency of one region can influence nearby recombination events, it can interfere with the genetic mapping. Interference explains this phenomenon, two chiasma located in close proximity can cause stearic hindrance during their formation. This causes increase or decrease in the formation of a second crossover by the presence of a first crossover.

Regards.

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IST IS RYT
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