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Aim : How does sexual reproduction occur?

Aim : How does sexual reproduction occur?. Look at the end result and what’s inside!!. MEIOSIS. Produces daughter cells that have half the number of chromosomes as the parent cell. Meiosis enables organisms to reproduce sexually . Gametes ( sperm and eggs ) are haploid. Gametogenesis

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Aim : How does sexual reproduction occur?

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  1. Aim: How does sexual reproduction occur?

  2. Look at the end result and what’s inside!!

  3. MEIOSIS Produces daughter cells that have half the number of chromosomes as the parent cell.

  4. Meiosis enables organisms to reproduce sexually. • Gametes (sperm and eggs) are haploid.

  5. Gametogenesis • Cell division that produces gametes

  6. Meiosis involves twodivisionsproducing a total of fourdaughtercells

  7. 1 2 4 cells with half the normal # of chromosomes • 2 stages: Meiosis I, Meiosis II 23 23 23 MEIOSIS II 46 MEIOSIS I 23 • 23 23

  8. Meiosis I Contains all phases of mitosis (IPMAT)

  9. Meiosis II • No interphase (PMAT) • No replication of chromosomes

  10. Meiosis in males Spermatogenesis All 4 new cells become sperm cells Testes

  11. Meiosis in females Oogenesis (in ovaries) 1 egg, 3 polar bodies (break down)

  12. In oogenesis, 4 daughter cells are produced, but 3 are a lot smaller. We call them polar bodies. • The polar bodies eventually disintegrate, leaving 1 ovum cell (egg) with haploid chromosomes. This normally happens once a month.

  13. So, what is the difference between mitosis and meiosis?

  14. Mitosis produces 2identical daughter cells with the samenumber of chromosomes as the parent. Meiosis produces 4 haploid cells (half the number of chromosomes as the parent it came from).

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