genetically

You really cannot tell by looking at them that they are so different genetically.

你真的不能通过观察他们得出他们的基因是如此不同的结论。

The initial quality, or type, of your skin is genetically determined – meaning that you are born with it.

皮肤起初的肤质，类型都是基因决定的，这意味着你出生时就是这样的皮肤。