Biology. of or pertaining to epigenesis, or the successive differentiation of undifferentiated cells in an embryo.
Genetics. noting or pertaining to epigenetics, specifically, the process by which the expression of genetic information is modified on a molecular level without a change to the DNA sequence: the epigenetic inheritance of longevity.

epi-+ genetic

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World English Dictionary
epigenetic (ˌɛpɪdʒɪˈnɛtɪk)
1.  of or relating to epigenesis
2.  denoting processes by which heritable modifications in gene function occur without a change in the sequence of the DNA

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Example sentences
Epigenetic markers also serve to predict clinical outcomes.
Unlike the human genome, however, the epigenetic code hasn't been mapped.
Exposure to pollution could cause direct genetic damage or epigenetic changes,
  which are changes in how genes are expressed.
One form of epigenetic change physically blocks access to the genes by altering
  what is called the histone code.
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