Question

As fsh acts on only one ovary then how 2 non identical twins are born

Answer 1

FSH rises as a woman gets older. FSH, or follicle stimulating hormone, is responsible for the development of eggs in the ovaries before they are released.

Higher levels of FSH are needed as a woman ages because the eggs require more stimulation to grow than in a younger woman.

This is somewhat ironic, given that increased FSH is also due to lowering fertility. But sometimes, the follicles overreact to the higher FSH levels and two or more eggs are released, resulting in a twin pregnancy.