In meiosis, a crossover in one position is thought to inhibit crossing-over in the neighboring regions. This regulatory mechanism …
A) results in a very uneven distribution of crossover points along each chromosome.
B) ensures that even small chromosomes undergo at least one crossover.
C) controls how the Holliday junctions are resolved.
D) All of the above.

Question

Quizplus · Accepted Answer

The poorly understood regulatory mechanism of crossover control ensures a roughly even distribution of crossover points along chromosomes. It also ensures that each chromosome undergoes at least one crossover every meiosis. For many organisms, roughly two crossovers per chromosome occur, one on each arm.

In Meiosis, a Crossover in One Position Is Thought to Inhibit