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Waddington held that cell fates were established in development (canalisation) much as a marble rolls down to the point of lowest local elevation.

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Epigenetic changes are preserved when cells divide.Most epigenetic changes only occur within the course of one individual organism's lifetime; however, these epigenetic changes can be transmitted to the organism's offspring through a process called transgenerational epigenetic inheritance.The microstructure (not code) of DNA itself or the associated chromatin proteins may be modified, causing activation or silencing.This mechanism enables differentiated cells in a multicellular organism to express only the genes that are necessary for their own activity.The similarity of the word to "genetics" has generated many parallel usages.

The "epigenome" is a parallel to the word "genome", referring to the overall epigenetic state of a cell, and epigenomics refers to more global analyses of epigenetic changes across the entire genome.In other words, as a single fertilized egg cell – the zygote – continues to divide, the resulting daughter cells change into all the different cell types in an organism, including neurons, muscle cells, epithelium, endothelium of blood vessels, etc., by activating some genes while inhibiting the expression of others.Historically, some phenomena not necessarily heritable have also been described as epigenetic.A radical epigenetic view (physiological epigenesis) was developed by Paul Wintrebert.Another variation, probabilistic epigenesis, was presented by Gilbert Gottlieb in 2003.Epigenetics most often denotes changes in a chromosome that affect gene activity and expression, but can also be used to describe any heritable phenotypic change that does not derive from a modification of the genome, such as prions.