Epigenetics is defined as the genetic control by factors other than an individual’s DNA sequence and they can switch genes on or off, determine which proteins are transcribed. We can see this property in many normal cellular processes and it contributes to differential expression. The best example of epigenetics is X-chromosome inactivation in female mammals. The silencing of genes can be accomplished by systems like, DNA methylation, histone modifications and RNA associated silencing. From many studies it is found that, lifestyle can affect the individual epigenetics and thereby health. Nuclear inheritance pattern is transmits from parent to younger generations (vertical transmission). On the other hand, this epigenetic pattern not transmits from generation to generation and nor between individuals. The identical twins also differ by their epigenetic patterns.
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