During prophase 1, homologous chromosomes pair and exchange DNA (homologous recombination) .

在前期 1，同源染色体配对并交换 DNA（同源重组）。

Zygotene Chromosomes approximately line up with each other into homologous chromosome pairs through synaptonemal complex.

偶线期染色体通过联会复合体大致排列成同源染色体对。

For every chromosome pair, one comes from each biological parent.

对于每一对染色体，一个来自每个亲生父母。

Biological males with an XY chromosome pair only get one copy of all these X chromosome genes, so the human body has evolved to function without duplicates.

具有一对 XY 染色体的生物男性仅获得所有这些 X 染色体基因的一个拷贝，因此人体已经进化到没有重复的功能。

In Klinefelter syndrome, the sex chromosome pairs which is either XX or XY don't separate in meiosis I in the male or female germ cell and this resulted in two gametes with a pair of X chromosomes and two gametes without X chromosomes.

Klinefelter综合征中，配对的XX或XY性染色体对在父亲或母亲的第一次减数分裂中没有分离，从而产生了两个有两条X染色体的配子以及两个没有X染色体的配子。