In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 50 primary oocytes?

This process described in the question is called OOGENESIS, which is the production of ovum (gamete) in females. It occurs that diploid germ cells in the female called oogonia undergoes mitotic division to produce diploid (2n) PRIMARY OOCYTES.

This primary oocyte undergoes meiotic division when the female is at puberty or has started her menstruation cycle to produce two daughter cells, one of which is the secondary oocyte and the other being a polar body. Both of these cells are haploid (n). The polar body is produced to reduce the chromosomal number of the primary oocyte as the chromosomes are equally shared between the two cells (secondary oocyte and polar body).

Therefore, if a primary oocyte undergoes meiosis to produce one secondary oocyte and polar body each. 100 primary oocytes will result in 100 secondary oocytes with each having their chromosome number reduced by half while 50 polar bodies will result from 50 primary oocytes.