In the Human X and Y Chromosomes, an Obligatory Crossover

Question

In the human X and Y chromosomes, an obligatory crossover in meiosis helps ensure proper:
A)gene dosage.
B)segregation.
C)independent assortment.
D)random distribution.

Accepted Answer

Obligatory crossover in meiosis ensures proper segregation of the X and Y chromosomes, which is important for maintaining the correct number of sex chromosomes in the gametes. Without crossover, the X and Y chromosomes may fail to properly segregate during meiosis, leading to gametes with abnormal chromosome numbers. While crossover may also contribute to independent assortment and random distribution of genetic material, these factors are not specifically related to the X and Y chromosomes.