这是一句定语从句,只不过先行词前面加了介词.这句话可以拆成两句
It is non-sexual reproduction.
In this reproduction,the embryo's genes come from one parent instead of two.
楼主可以发现上下两句reproduction重复了.所以两句合并可以把reproduction改成which
再给你几句例句琢磨一下
A final consideration is the environment in which we live and work.
That is an alarming question in a business in which new entrants struggle.
当然不只是in which 还可以是from which/ by which 等等
如You are the bows from which your children as living arrows are sent forth.
Efficiency is not an ultimate standard by which an economic system should be judged.
he speed with which they could eventually recover might surprise.