Because most of the Y chromosome does not participate in sexual recombination,it has degenerated both in size and gene content,in comparison with the X chromosome.

• 与X染色体相比,由于Y染色体大部分不参与性染色体的重组,使它无论在大小还是基因数量上都出现了退化,未来的男性或许会面临生存的问题。