Y染色体起初原本拥有一套与X染色体相同的基因，但它们在2亿年的进化长河中消失殆尽。

In the y, which originally had the same set of genes as the X, most of the X-related genes have disappeared over the last 200 million years.

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利用杂合子发育过程中来自父本的染色体完全、迅速地消失得到大量单倍体胚。

Haploid embryos which only with chromosome of female parent were obtained due to the chromosome elimination of pollen parent quickly and completely during the heterozygote development.

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