1. DNA replication creating a tetraploid (4n) cell
Interphase
Cell grows in preparation for DNA replication
Centrosome (centromeres + the microtubules which make up the spindles) replicates
Growth 1 phase (G1)
DNA replication creating a tetraploid (4n) cell
46  92 chromosomes
Synthesis phase (S)
Cell grows in preparation for mitosis
Growth 2 phase (G2)

2. Nuclear membrane fragments
Prophase I
Meiosis I
Chromatin condenses into chromosomes – two sister chromatids held together by the centromere
Nuclear membrane fragments

3. Prophase I
Meiosis I
Chromatin condenses into chromosomes – two sister chromatids held together by the centromere
Nuclear membrane fragments
Crossing over occurs creating recombinant chromosomes

4. Prophase I
Meiosis I
Chromatin condenses into chromosomes – two sister chromatids held together by the centromere
Nuclear membrane fragments
Crossing over occurs creating recombinant chromosomes
Spindle attach to centromere

5. Independent assortment – Chromosomes randomly align along the equator
Metaphase I
Meiosis I
Independent assortment – Chromosomes randomly align along the equator

6. Homologous chromosomes separate to give each daughter cell equal DNA
Anaphase I
Meiosis I
Homologous chromosomes separate to give each daughter cell equal DNA

7. The cell elongates and forms cleavage (cytokinesis)
Telophase I
Meiosis I
The nucleoli reappear
The cell elongates and forms cleavage (cytokinesis)

8. The cell elongates and forms cleavage (cytokinesis)
Telophase I
Meiosis I
The nucleoli reappear
The cell elongates and forms cleavage (cytokinesis)
2 non-identical diploid (2n) daughter cells form
92  46 chromosomes

9. Nuclear membrane fragments
Prophase II
Meiosis II
Nuclear membrane fragments
Spindle attach to centromere

10. Chromosomes align along the equator
Metaphase II
Meiosis II
Chromosomes align along the equator

11. Chromatids separate to give each daughter cell equal DNA
Anaphase II
Meiosis II
Chromatids separate to give each daughter cell equal DNA

12. The cell elongates and forms cleavage (cytokinesis)
Telophase II
Meiosis II
The nucleoli reappear
The cell elongates and forms cleavage (cytokinesis)

13. The cell elongates and forms cleavage (cytokinesis)
Telophase II
Meiosis II
The nucleoli reappear
The cell elongates and forms cleavage (cytokinesis)
4 non-identical haploid (n) daughter cells (gametes) form
46  23 chromosomes