Epigenetics is a type of gene regulation that can be passed from a cell to its daughters. The most common mechanism is methylation.

外因遗传是一种可以传给下一代细胞的基因调控过程，最常见的方式是通过甲基化作用来完成，该作用可以让甲基（由一个碳原子和三个氢原子组成）附着于腺嘌呤或胞嘧啶上。