Why are men able to generate sperm, but women are born with a set number of eggs?

Question

I was told all humans start as female and then the ovaries descend and become testis. Why are females limited in this capacity?

In: Biology

Answer 1

We actually see in other mice that females can produce eggs after they are born and I believe they also found that if they graft the human ovarian stem cell onto mice they also produce eggs. I don’t think they have seen it in humans though because they can’t experiment on a living person. But perhaps we could transplant these cells in women who are struggling to conceive.

https://www.sciencedaily.com/releases/2012/07/120726180259.htm