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| Description: While in the mature follicle, the diploid primary oocyte completes meiosis I producing a haploid secondary oocyte (with the majority of the cytoplasm) and a haploid first polar body. At ovulation, both cells and the corona radiata enter the uterine tube. If sperm are present and fertilization takes place, the secondary oocyte continues into meiosis II. An ovum and a second polar body form. The ovum becomes a zygote when it unites with the sperm. Picture Stats: Views: 275 Filesize: 771.48kB Height: 1000 Width: 750 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40571 |