These reference populations contain SNPs known to exist more frequently in different modern populations in the world.

这些参考人群包含了世界上不同现代种群中更为常见的单核苷酸多态性。

And most testing companies aren't clear about how many people are represented in their reference populations.

大多数测试公司并不清楚他们的参考人群中有多少人。

When a testing company receives your sample, they compare your pattern of SNPs to different reference populations in their database.

当测试公司收到您的样本时，他们会将您的 SNP 模式与数据库中的不同参考人群进行比较。

Second, testing companies put together their reference populations based on academic research and other people that have taken genetic ancestry tests.

其次，测试公司根据学术研究和其他进行过遗传血统测试的人，将他们的参考人群放在一起。

So it's not that you overall are eighty-five percent West Asian, but that the particular spot that they happened to look at, eighty-five percent of those locations are associated with Western Asia in their reference population.

这并不是说你们总体上是85%的西亚人，而是说他们碰巧看到的那个部分，在他们的参考人口中，85%的那一部分与西亚有关。