A cellular epigenetic process in which certain genes within an organism's cells are "disabled" (e.g., via methylation) during the earliest stage(s) of the organism's development. For example, the embryo of a female mammal (which receives two copies of the X chromosome-- one from each parent) disables one of those copies, at random, in each of its cells, so the female becomes a genetic mixture of its two parents.

The term "Imprinting" also appears in the definition(s) of the following term(s):
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