Which of the Following is an Example of an Epigenetic

Question

Which of the following is an example of an epigenetic change in eukaryotes?
A) a loss of an AT base pair from a gene
B) the addition of methyl groups to cytosines in the promoter region of a gene
C) the substitution of an AT base pair by a GC base pair in a gene as a result of a mistake during DNA replication
D) a deletion that simultaneously removes two genes from the genome
E) None of these examples represents epigenetic changes.

Accepted Answer

Epigenetic changes involve modifications that affect gene expression without altering the DNA sequence itself. The addition of methyl groups to cytosines, particularly in the promoter region of a gene, is a common epigenetic modification that can regulate gene expression.