是用于量化世系树中被标记出的末梢的共有祖先的统计资料。
The genealogical sorting index ( gsi ) is a statistic to quantify the common ancestry of labeled tips on a tree.
她们全体有一个共同的女祖先；由于世系出自同一个女祖先，后代的所有女性每一代都是姊妹。
They all have a common ancestral mother, by virtue of their descent from whom the female offspring in each generation are sisters.
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