发生此类现象是因为一个嵌合双胞胎会产生于没有得到雄性动物施精的卵, 但它会在某些皮肤细胞中含有该雄性动物的遗传基因.
This couldhappen because a chimeric twin that grew from an egg which his sperm did notfertilise would nonetheless have some skin cells containing his genes.
前者包括生殖托的发生、精卵的排放及合子的发育与环境因子的关系。
The former includes the occurrence of receptacles, the liberation of sperms and eggs, and the relation between the development of zygotes and environmental factors.
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