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Meiosis

Explore the intricate process of meiosis, where DNA is replicated and homologous chromosomes undergo two divisions within the nucleus. From Prophase 1 to Telophase 2, witness the stages and understand how it results in 4 haploid cells. Learn about Crossing Over and Genetic Variation through DNA exchange between chromosomes.

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Meiosis

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Presentation Transcript

  1. Meiosis 2 divisions of the nucleus

  2. DNA is replicated forming homologous chromosomes

  3. Prophase 1 • Chromosomes condense • Nuclear envelope disappears • Crossing over occurs between Homologous chromosomes.

  4. Metaphase 1 • Pairs of homologous chromosomes move to the equator

  5. Anaphase 1 • Homologous chromosomes move to opposite poles

  6. Telophase 1 • Chromosomes gather at the poles • Cytokinesis

  7. Prophase 2 • New spindle forms around chromosomes

  8. Metaphase 2 • Chromosomes line up at equator

  9. Anaphase 2 • Centromere divides • Chromatids (now chromosomes) move to opposite poles

  10. Telophase 2 • Nuclear envelope forms around each set of chromosomes • Cytokinesis • Results in 4 haploid cells (gametes)

  11. Genetic Variation • Variation generated quickly

  12. Crossing over • DNA exchange between homologous chromosomes

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