Final answer:
During human oogenesis, a primary oocyte carries 46 chromosomes, which is halved in the secondary oocyte. The polar body usually disintegrates and if the secondary oocyte is fertilized, it completes meiosis.
Step-by-step explanation:
A primary oocyte carries 46 chromosomes in human oogenesis. During oogenesis, the primary oocyte undergoes meiosis to produce a secondary oocyte with half the number of chromosomes, as well as a polar body that usually disintegrates. If the secondary oocyte is fertilized, it completes meiosis and becomes an ovum with 46 chromosomes.