Meiosis

• Reduces the amount of chromosomes in a cell by half each time, by seperating Homologus Chromosomes.

• What is meiosis? ;; Seperating Homologus Chromosomes by half, until we get Haploid cells.

• Meiosis only happens to produce Gametes.

• How many Haploid Gametes will one Diploid cell produce through Meiosis? ;; 4

• There is Meiosis 1 and Meiosis 2

  • Meiosis 1

    • Chromosomes are replicated beforehand.

    • Similar to how Mitosis would replicate Chromosomes.

    • Prophase 1

      • Chromosomes bundle up

      • In meiosis, one homologus chromosome forms a tetrad.

      • What is a tetrad? ;; 4 Chromatids together, or two Homologus Chromosomes.

      • 4 Chromatids in one tetrad.

    • Metaphase 1

      • Tetrads line up

    • Anaphase 1

      • Tetrads break apart, go into new cells.
      • Chromosomes still connected with centromeres.

    • Telophase 1

      • Creates two Haploid cells.
  • Meiosis 2
    • Prophase 2
      • Pairs sister Chromatids at center
    • Metaphase 2
      • Sister chromatids line up at middle
    • Anaphase 2
      • Move to opposite side
    • Telophase 2 + Cytokinesis
      • 4 Haploid gametes.

Crossing Over in Meiosis

Mixing of Alleles