Here's a brief summary of Gregor Mendel's contribution to the foundations of modern genetics:
http://www.accessexcellence.org/RC/AB/BC/Gregor_Mendel.php
Re my example of the 'heritable' effects of smoking: Mitochondrial DNA, passed on from mothers to daughters only, seems to play a central role in recent epigenetics (non-Mendelian genetics):
https://notes.utk.edu/bio/greenberg.nsf/0/b360905554fdb7d985256ec5006a7755?OpenDocument
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