DNA is not the whole story of how we inherit genetic information from our parents (and grandparents). In fact, researchers are finding that environmental factors during the lifetime of our parents and grandparents influence how and when our DNA is expressed. So, you might be wondering how is this possible?
Epigenetics attempts to identify the mechanisms by which heritable information is transferred between generations that is not caused by changes in DNA. Though the processes and mechanisms associated with epigenetics are complicated, the TED talk that I have linked does a really good job of breaking down the known mechanisms of epigenetic inheritance.
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