Here's another picture of it here, showing it in a little bit more detail, that you have lots of DNA in each of the cells in your body but you're not using all that DNA at any one time.

这里有一张更加详细的图片,来说明这一点,人体内每个细胞中都含有大量DNA,但并不是所有的DNA都会同时发挥作用

耶鲁公开课 - 生物医学工程探索课程节选