Question

The chromosome maps are not accurate maps because

• A. Crossing over frequency is higher than recombination frequency
• B. One crossing over interferes and increases the frequency of nearby crossing over
• C. Crossing over frequency decreases towards the ends of chromosome
• D. Heterochromation increases crossing over

Answer 1

The correct option is B One crossing over interferes and increases the frequency of nearby crossing over

The chromosome maps are not accurate maps because one crossing over interferes and increases the frequency of nearby crossing over. The recombination at one place increases or decreases the chances of recombination in the nearby place. This is because crossing over at one place causes stearic hindrance. This interferes with the genetic mapping.

Thus, the correct answer is 'One crossing over interferes and increases the frequency of nearby crossing over.'