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Darwin, as we noted in the preceding chapter, never hit upon the utterly necessary idea of a gene, but along came Mendel’s concept to provide just the right structure for making mathematical sense of our heredity. And then, when DNA was identified as the actual physical vehicle of the genes, it looked at first (and still looks at many participants) as if Mendel’s genes could be simply identified as particular hunks of DNA. But then complexities began to emerge, the more scientists have learned about the actual molecular biology of DNA and its role in reproduction, the clearer it becomes that the Mendelian story is at best a vast over simplification. Some would go so far as to say that we have recently learned that there really aren’t any Mendelian genes! Having climbed Mendel’s ladder, we must now throw it away. But of course no one wants to throw away such a valuable tool, still proving itself daily in hundreds of scientific and medical contexts. … ~ Page 58
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