meiosis

• meiosis context

  • a type of cell division in sexually reproducing organisms (ie. testes or ovaries) that reduces the number of chromosomes in gametes (sex cells)
  • it makes sperm and egg cells (gametes)
  • undergoes reductional division

  
• Meiosis 1

  1. prophase: homologous pairs crossing over, sharing genetic info.
  2. metaphase: middle, chromosome pairs align in middle
  3. anaphase: away, chromosomes pulled away by spindle fibres
  4. telophase:two newly formed nuclei, thus 2 new cells

  Meiosis 2

  1. prophase:
  2. metaphase:
  3. anaphase:
  4. telophase:
• Meiosis 1

  1. prophase: chromosomes condense and line up with homologous pairs, crossing over occurs thus transferring genetic information
  2. metaphase: PAIRS OF chromosomes are in the middle of the cell
  3. anaphase: chromosomes are pulled away by spindle fibres to opposite sides
  4. telophase: two newly formed nuclei

  
• Meiosis 2

  1. prophase: spindle fibers form and nucleus membrane breaks down
  2. metaphase: chromosomes (each with 2 sister chromatids) line up in the middle
  3. anaphase: chromatids are pulled away by spindle fibers rather than homologous chromosomes in anaphase 1
  4. telophase: chromatids are on opposite sides in both cells and nucleus membrane forms.
  5. cytokinesis splits the cytoplasm so there are 4 cells