Answer:
The field of epigenetics investigates how environmental factors and behaviour may alter how your genes function. While epigenetic mechanisms can alter how the body interprets a DNA sequence, these are reversible and never alter the DNA sequence as genetic changes do.
Identical twins provide excellent research subjects for examining the impact of epigenetic mechanisms, modifications to the DNA that regulate gene expression rather than the DNA sequence itself.
Even though twins are epigenetically impossible to distinguish in the first few years of life, we discovered that the older monozygous twins showed impressive differences in the quantities and dispersion of 5-methylcytosine DNA as well as histone acetylation in there own genomes, which had an impact on their gene-expression profile.
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