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Epigenetics
heritable changes in gene function, without changes to the base sequence of DNA
Methylation
changes the structure of DNA preventing RNA polymerase from accessing the DNA and transcribing genes
Acetylation
uncoils DNA so RNA polymerase can more easily transcribe exposed genes
how methylation happens
methyl group tags DNA
how acetylation happens
acetyl group tags histone tails
why epigenetics are important
controls gene expression meaning genes can be turned off when not needed