And since there are many genetic variants, and they have different such gradients, this means that if we determine a DNA sequence -- a genome from one individual -- we can quite accurately estimate where that person comes from, provided that its parents or grandparents haven't moved around too much.
它们的变化率也不同 这意味着如果我们鉴别出一个DNA序列 即某个人的基因组 我们就可以非常准确地推算出 这个人来自何方 假设这个人的父母或祖父母 基本都留在一个地方