Meiosis I

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<p><span>Chromosomes condense Nuclear envelope disappears</span></p><p><span>Two centrosomes start forming the spindle</span></p><p><span>Each chromosome composed of 2 sister chromatids</span></p><p><span>Homologous chromosomes crossover, exchanging DNA</span></p>

Chromosomes condense Nuclear envelope disappears

Two centrosomes start forming the spindle

Each chromosome composed of 2 sister chromatids

Homologous chromosomes crossover, exchanging DNA

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Prophase I

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<p><span>Homologs still stuck together </span></p><p><span>Pair of homologs</span></p><ul><li><p><span>Microtubules from opposite poles attach to each homolog</span></p></li><li><p><span>Homologs are aligned at the metaphase plate side-by-side</span></p></li><li><p><span>Orientation of each pair of homologs on the spindle is random</span></p></li></ul>

Homologs still stuck together

Pair of homologs

  • Microtubules from opposite poles attach to each homolog

  • Homologs are aligned at the metaphase plate side-by-side

  • Orientation of each pair of homologs on the spindle is random

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Metaphase I

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<p><span>Chromosomes condense Nuclear envelope disappears</span></p><p><span>Two centrosomes start forming the spindle</span></p><p><span>Each chromosome composed of 2 sister chromatids</span></p><p><span>Homologous chromosomes crossover, exchanging DNA</span></p>

Chromosomes condense Nuclear envelope disappears

Two centrosomes start forming the spindle

Each chromosome composed of 2 sister chromatids

Homologous chromosomes crossover, exchanging DNA

Prophase I

2
New cards
<p><span>Homologs still stuck together </span></p><p><span>Pair of homologs</span></p><ul><li><p><span>Microtubules from opposite poles attach to each homolog</span></p></li><li><p><span>Homologs are aligned at the metaphase plate side-by-side</span></p></li><li><p><span>Orientation of each pair of homologs on the spindle is random</span></p></li></ul>

Homologs still stuck together

Pair of homologs

  • Microtubules from opposite poles attach to each homolog

  • Homologs are aligned at the metaphase plate side-by-side

  • Orientation of each pair of homologs on the spindle is random

Metaphase I

3
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<ul><li><p><span>HOMOLOGS are separated by 2 forces</span></p></li></ul><ul><li><p><span>Spindle elongation</span></p></li><li><p><span>Shortening of the microtubules attached to chromosomes</span></p></li><li><p><span>Sister chromatids remain attached to each other at their centromeres</span></p></li></ul>

  • HOMOLOGS are separated by 2 forces

  • Spindle elongation

  • Shortening of the microtubules attached to chromosomes

  • Sister chromatids remain attached to each other at their centromeres

Anaphase I

4
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<p> <span>Nuclear envelope re-forms around each daughter nucleus</span></p><ul><li><p><span>Sister chromatids are no longer identical because of crossing over (prophase I)</span></p></li><li><p><span>Cytokinesis occurs after telophase I</span></p></li><li><p><span>Meiosis II occurs after an interval of variable length</span></p></li></ul>

Nuclear envelope re-forms around each daughter nucleus

  • Sister chromatids are no longer identical because of crossing over (prophase I)

  • Cytokinesis occurs after telophase I

  • Meiosis II occurs after an interval of variable length

Telophase I