Methyl group

In chemistry, methyl refers to a group of atoms with the formula  - one carbon atom with chemical bonds to three hydrogen atoms. It is a functional group in organic chemistry and ligand in organometallic chemistry. Methyl is the simplest alkyl group.

 In genetics 
Methyl groups added to cytosine are the basis of epigenetics. They change the way genes act, and so explain how (for example)  identical twins may turn out differently later in life. Or, they help understand how a mother's nutrition may have long-lasting effects on her offspring.Carey, Nessa 2011. The epigenetics revolution: how modern biology is rewriting our understanding of genetics, disease and inheritance. London: Icon Books. ISBN 978-184831347-7

 References 

Related pages
Methylation
Chemical bond
Chemical reaction
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Category:Epigenetics
Category:Alkyl groups