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Meiosis and Sexual Reproduction

Meiosis and Sexual Reproduction. Chapter 7. Meiosis. Formation of gametes The process of cutting chromosome number in half 2 Divisions Reduction Production . Let’s Make a Gamete : 1. Prophase 1. Chromosomes become visible Nucleus breaks down. Prophase 1: Crossing Over.

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Meiosis and Sexual Reproduction

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  1. Meiosis and Sexual Reproduction Chapter 7

  2. Meiosis • Formation of gametes • The process of cutting chromosome number in half • 2 Divisions • Reduction • Production

  3. Let’s Make a Gamete : 1. Prophase 1 • Chromosomes become visible • Nucleus breaks down

  4. Prophase 1: Crossing Over • Crossing over occurs • Portions of a chromatid on one homologous chromosome are broken and exchanged with the corresponding portions on the other homologous chromosome

  5. Creates Genetic Diversity !!!!!! Survial of a species

  6. Metaphase 1 • Pairs of chromosomes move to middle of the cell

  7. AnaPhase 1 • Homologous pairs move to opposite ends of the cell

  8. Telophase 1 and cytokinesis • Chomosomes move to end of cell • Cytoplasm divides • Chromosome number cut in half!!!!!!!

  9. Division 2 Meiosis

  10. Prophase II • Happens in both cell at the same time • A new spindle forms

  11. Metaphase II • Chromosomes line up at the equator

  12. Anaphase II • Centromeres divide • Chromosomes move to opposite ends of cells

  13. End of Meiosis

  14. Telephase II • Nuclear membrane reappears • Cytokinesis • Result: ? • 4 Haploid Gametes • Egg (ovum) • Sperm

  15. Meiosis Animation

  16. White Boarding

  17. Name this phase?

  18. Name this phase?

  19. Phase? Haploid or diploid

  20. Phase?

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