Which of the following is an example of an epigenetic change?
a) Loss of the bonds between base pairs
b) Addition of methyl groups to cytosines of a gene to alter gene expression
c) Substitution of several base pairs to alter the nucleotide sequence for a gene
d) Deletion that removes two whole genes from the genome
e) Change in the consensus sequences of promoter regions
Ans: b) Addition of methyl groups to cytosines of a gene to alter gene expression
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