A variation in gene function that does not involve a change in dna sequence but can be inherited is an epigenetic.
The field of epigenetics is concerned with heritable phenotypic changes that do not result from changes in the DNA sequence. Epigenetics, which derives its name from the Greek prefix epi-, refers to traits that are "on top of" or "in addition to" the conventional genetic basis for heredity. However, the term can also be used to describe any heritable phenotypic change. Epigenetics is most frequently associated with alterations that impact gene activity and expression. These modifications to cellular and physiological phenotypic features may be the result of external or environmental influences or be a normal component of development.
The phrase also refers to the modifications made to the genome that are relevant from a functional standpoint but do not affect the nucleotide sequence.
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