它们别无选择，因为这种分配方式是从部分父母的基因中遗传下来的。
No choice is involved; this allocation comes as part of the genetic package from the parents.
不一会儿，有一道命令传下来，所有的生物立刻从台阶上走开，不见了。
Presently a command was given, and immediately all living creatures vanished from the steps.
研究者说，他们检测到了这些从布什曼人的直系后代中遗传下来的绝大多数基因变体。
Most of the many variations detected in their genomes were acquired after they branched off from the main lineage, the researchers said.
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