Final answer:
Crossover interference is the phenomenon that inhibits a second crossover event in nearby regions of a chromosome. It reduces the observed double crossover frequency and helps maintain genetic diversity and accuracy in genetic recombination.
Step-by-step explanation:
The phenomenon through which a crossover event in one region of the chromosome inhibits a second event in nearby regions that reduces the observed double crossover frequency related to the expected number of double crossovers is called crossover interference. It is a mechanism that ensures crossovers are spaced out along the chromosome and prevents them from occurring too close together. This phenomenon helps maintain genetic diversity and accuracy in the process of genetic recombination.