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Genetic Change

Variation and Selection: What's the Difference? What Are the Issues?

James A. Shapiro | Posted 07.17.2012 | Science
James A. Shapiro

How could natural selection operate so that "the good ones spread in the population" if there were no positive variants in the first place? That is why I am confounded by Jerry Coyne's comment that he can explain natural genetic engineering by "garden variety natural selection."