This biggest advance in genetics at the time came when Charles Darwin, in support of his theory of evolution by natural selection, put forth a modified version of pangenesis (DNA Watson). According to Darwin, the organs of an animal had "gemmules" that accumulated in the sex organs and were consequently exchanged during sexual reproduction (Darwin Species). His theory differed from the original pangenesis line of thought in that gemmules were in constant production during the organism's lifetime, thus if an advantageous change were to affect the organism, it could be passed on to its of...

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