The human population contains a great variety of genetic variation, but drugs are tested on just a few thousand people.

人类群体中有各种各样的基因变异，但是药物只在几千人身上进行测试。

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Their allele frequencies at numerous genetic loci gradually become more and more different as new alleles independently arise by mutation in each population.

随着新等位基因在每个群体中独立突变产生，它们在许多遗传位点上的等位基因频率逐渐变得越来越不同。

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The best information on early population movements is now being obtained from the 'archaeology of the living body', the clues to be found in genetic material.

关于早期人口迁移的最佳信息现在可以从“活体考古学”中获取，这是在遗传物质中发现的线索。

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To test the effectiveness of these antibodies, the two researchers injected cells that belonged to one genetic population of mice into the leg muscles of mice from a different genetic population.

ECONOMIST: Breaching the body's defences

The principle would work, he says, for any species with a genetic structure to its population.

ECONOMIST: DNA tracking

Many biologists see cloning as a last resort since, unlike sex, it does not increase the genetic diversity of a population.

ECONOMIST: Endangered species