First, you can decide to exit if there is no variety in the DNA pool anymore.

首先，当dna池里不再有变化时，您就可以决定退出。

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DNA studies, for example, suggest that our ancient human ancestors interbred, with Neanderthals possibly being absorbed into our gene pool and disappearing as their own distinct hominid species.

例如，DNA研究就显示古代人类的祖先也曾进行杂交，尼安德特人的基因很可能已被我们的基因库所吸收，而他们做为不同的原始人类物种却已经消失。

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Recent DNA studies have indicated that the neandertal was an entirely different species and did not merge into the H. sapiens sapiens gene pool.

最近的基因研究已经表明，穴居人是一个完全不同的物种，并没有合并到智人智人基因库。

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Microsoft will continue to complain because playing dirty pool is in their corporate DNA. Google has made some stupid mistakes in the last few years (being in China, Google Buzz, poor explanation of capturing WiFi packets, etc.), but compared to Microsoft, they are far better for the consumer in this dimension since Microsoft will do anything and everything to have their way.

FORBES: Assessing Winners and Losers in Google's Worldwide Antitrust Battles

But this relies on the person either being among a pool of suspects identified by the police or having their profile in a DNA database.

BBC: Forensic test can predict hair and eye colour from DNA