3. why is it important that the primary and secondary oocytes contain the majority of the cytoplasm leaving the polar oocytes with so little?

It initiates before birth and lasts till fertilization. Oogenesis starts when oogonia which are the juvenile eggs that structure in the ovaries before birth and have chromosomes in diploid number, experience mitosis to frame essential oocytes, likewise with the diploid number.  

Oogenesis continues as essential oocytes experiences the primary cell division of meiosis to shape optional oocytes with the haploid number of chromosomes. Auxiliary oocytes just experience the second meiotic cell division to frame a haploid ovum in the event that it is treated by a sperm. The one egg cell that comes from meiosis contains the vast majority of the cytoplasm, supplements, and organelles.  

This inconsistent conveyance of materials produces one huge cell, and one cell with minimal more than DNA. This other cell, known as a polar body, in the long run separates. The bigger cell experiences meiosis II, indeed creating a huge cell and a polar body. The huge cell forms into the develop gamete, called an ovum.  

The inconsistent conveyance of the cytoplasm during oogenesis is essential as the zygote that outcomes from preparation get the majority of its cytoplasm from the egg. So the egg needs to have much cytoplasm as could be expected.