That assumption was based on studying mitochondrial lineage - a small part of the genome , or dna , that is passed exclusively from mothers to offspring .
这一假设基于线粒体世系研究也就是基因或是脱氧核糖核酸的一小部分物质,同时仅仅由母亲传给子嗣。
Not only , at 2600 years , is japan 's easily the world 's oldest monarchy , but it also boasts an unbroken male lineage ( though eight women have over time stood in as caretaker empresses ) .
Since kim jong-un , who is in his 20s , lacks achievements of his own , the nickname emphasizes the one trait likely to reinforce his legitimacy : his lineage .
由于20多岁的金正恩没有属于自己的业绩,这个称呼强调是对加强他的合法性可能有用的一个特征:血统。
The traditional explanation for our nine-month gestation period and helpless newborns is that natural selection favored childbirth at an earlier stage of fetal development to accommodate selection for both large brain size and upright locomotion-defining characteristics of the human lineage .
What is more , historians of the imperial household agency ( iha ) can affirm , the lineage is descended from amaterasu , the sun goddess born not by caesarean section , as was the latest little tyke , but from an eye of the god izanagi .
The asian lineage leading to first americans is the most anciently diverged , whereas the asian lineages that contributed some of the dna to eskimo-aleut speakers and the na-dene-speaking chipewyan from canada are more closely related to present-day east asian populations .