In 1994, Rudolf Raff and colleagues at Indiana University in the USA decided to use genetics to put a number on the probability of evolution going intoreverse.
1994年,美国印第安纳大学的鲁道夫·拉夫和他的同事们决定用遗传学的方法来计算进化发生逆转的概率。
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Two inward sniffs move it forward. Two outward ones put it intoreverse.