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The methylation state of an individual cpg island:
is fixed; such genes are permanently turned off. is fixed, but this has no effect on whether genes are expressed. can change over time in response to environmental cues, but this has no effect on gene expression. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. is random sometimes the cytosines are methylated and sometimes they're not, but the state is independent of the environment or cell type.
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The methylation state of an individual cpg island:
is fixed; such genes are permanently turn...
is fixed; such genes are permanently turn...
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