Question

The Y chromosome undergoes recombination with which chromosome?

A It recombines along the length of the X chromosome
B It recombines with a specific region of the X chromosome
C It only recombines when there is a Y chromosomal duplication
D It often exhibits nonhomologous recombination with autosomes
E It does not undergo recombination

Answer 1

The Y chromosome undergoes recombination with a specific homologous region on the X chromosome known as the pseudoautosomal region during prophase I of meiosis. This results in genetic diversity but is limited to that specific part of the X chromosome.

Step-by-step explanation:

In humans, the Y chromosome undergoes recombination with a specific region of the X chromosome. This region is known as the pseudoautosomal region, which is the segment of homology between the X and Y chromosomes that allows them to pair up during prophase I of meiosis. A partial synaptonemal complex forms between these homologous regions, enabling crossover, or recombination, to occur. This process results in genetic diversity through the exchange of genetic material between the sex chromosomes.

It's important to note that, unlike autosomes that recombine over their entire length during meiosis, the X and Y chromosomes only engage in this recombination at the pseudoautosomal regions, ensuring the correct segregation of the sex chromosomes in sperm cells.