In a documentary, they were saying that epigenetics changes caused by the environment in an individual can be transferred to the following generations. I have some questions on that:
How many generations are affected by an epigenetic change? can this be permanent?
Can drugs cause epigenetics changes in the current population that are visible in the following generations in the form of disease and birth defects?
Do epigenetic play any role in evolution? For example, is it possible that an epigenetic change becomes a permanent genetic change after a certain number of generations?