Cell Division YouTube Lecture Handouts for CBSE Board Exam

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Watch video lecture on YouTube: Cell Division - Mitosis & Amitosis; 5 Stages of Mitosis - Memory Tricks Cell Division - Mitosis & Amitosis; 5 Stages of Mitosis - Memory Tricks
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Dr. Manishika Jain in this session explains the concept of cell division - mitosis and amitosis. 5 stages of mitosis are explained:ProphasePrometaphaseMetaphaseAnaphaseTelophaseFollowed by cytokinesis.

Key Contributors

  • Rudolf Virchow: omnis cellula e cellula (cell is derived from cell)

  • Strasburg: nucleus formed from preexisting ones

  • Boveri & Flemming: Somatic cell division

  • Flemming: coined mitosis

  • Benedin, Strasburger, Sutton & Winiwater: Chr. Reduced to half in gametes

  • Farmer & Moore: gave term meiosis

INTERPHASE

  • The cell is preparing for division.

  • Organelles replicate.

  • DNA is duplicated

  • Cell increases in size.

  • Majority of the cell's lifespan is spent in interphase.

PROPHASE

  • Chromosomes condense

  • Mitotic spindle is formed from microtubules that gradually lengthen driving the division of the cell.

METAPHASE

  • Nuclear envelope breaks down

  • Condensed chromosomes come into direct contact with the microtubules

  • Condensed chromosomes line up along the equator

ANAPHASE

  • Sister chromatids are drawn to opposite poles

  • Duplicate copies of the cell's DNA are on either side of the cell

  • Microtubules get shorter, which begins to allow the cell to separate.

TELOPHASE

  • Nuclear envelope reforms as two new nuclear envelopes around the separated sister chromatids.

  • Cytokinesis takes place.

  • Cytoplasm is equally divided between the two new daughter cells