It turns out that not all heritable traits (those that can be passed on to your offspring and beyond) are located within the nucleotide sequence of the DNA.  Experiences during your lifetime that do not mutate the ACTGs of your DNA can still have an effect that can be passed along to your future generations.  These changes are called epigenetic changes and offer fascinating new insights and possibilities in the world of genetics.  Go to my wiki page on epigenetics and follow the links to read several articles on epigenetics, genomic imprinting and new research findings.

Epigenetics wiki page