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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)
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Nuclear membrane fragments
Prophase I Meiosis I Chromatin condenses into chromosomes – two sister chromatids held together by the centromere Nuclear membrane fragments
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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
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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
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Independent assortment – Chromosomes randomly align along the equator
Metaphase I Meiosis I Independent assortment – Chromosomes randomly align along the equator
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Homologous chromosomes separate to give each daughter cell equal DNA
Anaphase I Meiosis I Homologous chromosomes separate to give each daughter cell equal DNA
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The cell elongates and forms cleavage (cytokinesis)
Telophase I Meiosis I The nucleoli reappear The cell elongates and forms cleavage (cytokinesis)
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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
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Nuclear membrane fragments
Prophase II Meiosis II Nuclear membrane fragments Spindle attach to centromere
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Chromosomes align along the equator
Metaphase II Meiosis II Chromosomes align along the equator
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Chromatids separate to give each daughter cell equal DNA
Anaphase II Meiosis II Chromatids separate to give each daughter cell equal DNA
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The cell elongates and forms cleavage (cytokinesis)
Telophase II Meiosis II The nucleoli reappear The cell elongates and forms cleavage (cytokinesis)
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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
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