1. CELL DIVISION Binary fission􀁠prokaryotes (bacteria)
􀁡Mitosis & Cytokinesis􀁠division of cells
􀁡Meiosis􀁠division to produce gametes (sex cells)

2. Cycle, Stages Eukaryotes 􀁡Interphase􀁠G1􀁠S􀁠G2
􀁡Mitotic Phase (M) 􀁠Mitosis (prophase, metaphase, anaphase, telophase)
􀁠Cytokinesis

3. Overview: 2n = two 2n Separate sister chromatids
2n (diploid) gives rise to 2n (diploid) and
2n (diploid

4. Interphase Interphase 􀁡G1 : first growth phase􀁠cytosol increase
􀁠 organelle division,
􀁡S : synthesis􀁠DNA replication
􀁡G2 : second growth phase􀁠microtubular assembly

5. Mitotic Phase (M Mitotic Phase (M)
􀁡Mitosis : division of DNA (precise) prophase,􀁠metaphase,􀁠anaphase,
􀁠telophase
􀁡cytokinesis : division of cytoplasm (rough

6. Comparison of Mitosis Animal􀁡centrioles􀁡astral rays􀁡cleavage furrow
Plant􀁡no centrioles􀁡no astral rays􀁡cell plate

7. Mitosis Exercises Mitosis Exercises 􀁡Chromosome replication
􀁠 answer questions
􀁡Slides; find interphase, mitosis, cytokinesis
􀁠whitefish blastula - animal
􀁠onion root tip - plant
􀁡Models of Mitosis, examine

17. Meiosis Meiosis 􀁡division of DNA to produce gametes that
are haploid (1n)
􀁡two divisions:􀁠Meiosis I􀁠Meiosis II
􀁡fertilization restores diploid number

18. Overview: 2n = four 1n Overview: 2n = four 1n ,2n gives 1n and 1n
Meosis I: separate homologues
Meosis II: separate sister chromatids
1n gives 1n and 1n

19. Sequence Sequence Interphase I * Meiosis I * Meiosis II
􀁠prophase I - prophase II
􀁠metaphase I - metaphase II
􀁠anaphase I - anaphase II
􀁠telophase I - telophase II
Cytokinesis Cytokinesis

20. Meiosis Exercises
Models of Meiosis, examine
􀁡Pop beads exercise

21. Mitosis: metaphase In the cell you have:
In metaphase the centromere of each chromosome lines up at the equator.
equator
In the cell you have:
-2 chromosomes (replicated chromosomes), one red and one yellow
-2 centromeres, one red and one yellow
Metaphase