但是，他们可以产生“单系”胚胎干细胞系，带有母系的两组染色体的单系胚胎被称为单性生殖。
They can, however, generate "uniparental" embryonic stem cell lines. Uniparental embryos with two maternal sets of chromosomes are known as parthenogenetic.
这样就废除了按女系计算世系的办法和母系的继承权，确立了按男系计算世系的办法和父系的继承权。
The reckoning of descent in the female line and the matriarchal law of inheritance were thereby overthrown, and the male line of descent and the paternal law of inheritance were substituted for them.
尽管一些氏族合并成更大的氏族，而另一些氏族则分裂成更小的氏族，但母系氏族制度在这一整个时期一直保持着。
The system of matrilineal clans was maintained throughout this period, even though some clans merged to form larger groups while others divided into smaller descent groups.
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