Only one egg is produced from 4 haploid cells as a result of meiosis. Oogenesis proceeds with primary oocyte undergoing first meiotic division forming secondary oocyte (haploid). ... Hence, one egg results from meiosis, which contains the most nutrients, cytoplasm, organelles.

Why does spermatogenesis result in four Spermatids but oogenesis only in one ovum?

Spermatogenesis leads to the formation of four spermatids from each primary spermatocyte, whereas each primary oocyte produces only a single ovum during oogenesis. This is due to the fact that during oogenesis meiotic division is unequal. ... The ovum retains the bulk of the cytoplasm and polar bodies degenerate.

Why does oogenesis in humans produce only one viable oocyte and 3 polar bodies instead of four viable oocytes?

Why does oogenesis in humans produce only one viable oocyte and 3 polar bodies instead of four viable oocytes? One oocyte contains all of the cytoplasm and resources to nourish the embryo.