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notes - Human Reproduction Sexual reproduction haploid sex...

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Human Reproduction Sexual reproduction - haploid sex cells (sperm and egg) come together at fertilization to form a diploid zygote Results in mixed genes and alleles (which is good) Female: - ovaries are site of gamete (egg) formation - follicles are developing eggs - females are born with between 40,000 and a half million follicles - “atresia” – natural process of follicle degeneration eventually leads to menopause - about 500 eggs are released during the female’s life (one every 28 days) Oogenesis - primary oocytes (egg precursor) - is a diploid cell that is paused at prophase of meiosis I remains paused/stopped during prophase of meiosis I until puberty - once/month Follicle Stimulating Hormone (pituitary) re-starts cycle completes meiosis I moves to II - egg enters meiosis II – cytoplasm divides (but divides unevenly) puts most of the stored energy/cytoplasm into one cell the other three degenerate - secondary oocyte (a finished egg) - polar bodies - luteinizing hormone from pituitary:
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