Within the genetic code, there are 30,000-40,000 highly organized regions called genes. Genes are the basic unit of heredity, and, unless you are an identical twin, the combination of genes inherited from your parents is unique to you.
在遗传密码中，有30,000-40,000个排列高度整齐的区域叫做基因。基因是遗传的基本单位，除非你是同卵双生，否则你从父母那里遗传的基因组合是独一无二的。你所拥有的基因组成了你的基因型。而它的产物，诸如眼睛的颜色，就是你的表现型。