DNA methylation patterns in parental cells are established and maintained in progeny cells by which of the following mechanisms?
A) Enzymes put a methyl group on cytosine residues of newly replicated CpG sequences base-paired with G-methyl-C sequences.
B) Methyl-CTP is incorporated into DNA during replication across from G-methyl-C sequences only.
C) When its gene is activated, a methyl group is added to certain CpG sequences in the promoter region.
D) Methylation of genes on the X chromosome only.
Correct Answer:
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