Epigenetics is the study of heritable changes in gene expression that occur without altering the underlying DNA sequence. It explores how environmental factors like nutrition and social conditions can affect which genes are turned "on" and "off" and influence traits without changing the DNA itself. Epigenetics sheds light on how a person's experiences and environment can impact their health and gene expression over their lifetime.

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45. WHAT IS EPIGENETICS?
• the study of heritable changes that occur
without a change in the DNA sequence

47. http://youtu.be/Xjq5eEslJhw

49. WHAT DOES IT DO?
• The field of epigenetics adds new fuel to this issue by s
hedding light on how environment, nutrition and
social conditions affect how genes are expressed.