Natural selection will preserve sequences with vital functions, but the rest of the genome will change because of drift.
自然选择将保存重要功能的基因序列,但是其他基因会因为漂变而被改变。
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“Natural selection is shaping the Y and keeping it vital to a degree that is really at odds with the idea of the last 50 years of a rotting Y chromosome, ” Dr. Page said.