1. Cellular Reproduction
Mitosis & Meiosis
Notes

2. 3-Step Process
DNA Replication
Nuclear Division
Cellular Division

3. DNA Replication DNA unzips and complementary strands are built
Template
Takes place during Interphase
Between cell divisions
Time of cell growth and protein synthesis
Majority of time

4. Nuclear Division
MITOSIS

5. Mitosis Body Cells – Somatic Cells
Process by which the nucleus divides
Produces two identical nuclei

6. Prophase 1st phase Centrioles move to opposite poles
Spindle fibers form
Chromosomes condense / visible
Nuclear membrane disappears

7. Metaphase
Chromatids line up at the equator

8. Anaphase
Chromosomes pull apart
Move toward opposite poles

9. Telophase Last phase Nuclear division
Nuclear membrane forms around each new nucleus
Chromosomes become invisible

10. Cell Division
Cytokinesis

11. Cytokinesis Division of cell’s cytoplasm and organelles
Two separate cells
Result is two diploid daughter cells identical to parent cell

12. Cytokinesis: Animal Cell
Microfilaments contract
Pinches in at equator to form cleavage furrow

13. Cytokinesis: Plant Cell
Cell wall formation between new cells
Cell Plate
Vesicles congregate

14. Cell Division
Meiosis

15. Meiosis Sex cells – gametes Germ cells in ovaries and testes
Sperm
Egg
Germ cells in ovaries and testes
Diploid cell produces haploid cells
Gametes
Involves two cell divisions

16. Process similar to mitosis: First Cell Division
Interphase – DNA replicated
Prophase I
Tetrads form (4)
Crossing over (genetic material exchange)
Metaphase I
Tetrads line up (pairs)
Anaphase I
Telophase I
Cytokinesis

18. Second Cell Division Interphase – NO DNA replication Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokinesis

21. Meiosis Result is 4 haploid daughter cells
Gametes
Gametes can combine to form a diploid cell with chromosomes from each parent
Like YOU!

22. Comparison…