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Understanding Meiosis: The Key to Sexual Reproduction Explanation

Learn how sexual reproduction occurs through the process of meiosis, producing haploid daughter cells essential for gamete formation in both males and females. Discover the differences between mitosis and meiosis and how they contribute to genetic diversity.

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Understanding Meiosis: The Key to Sexual Reproduction Explanation

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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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