1. Mitosis and meiosis
Cell Replication

2. It’s all about the dna...

3. Genetic storage Humans are a diploid (2n) species; 46 chromosomes
Humans gametes are haploid (n); 23 chromosomes

4. Cell replication: 2 options
1) MITOSIS: division of a nucleus into two genetically identical nuclei (IPMAT)
Somatic cells
2) MEIOSIS: division of nucleus that involves two divisions and one duplication of chromosomes; results in haploid (n) gametes with one chromosome from each homogolous pair
Gametes (sex cells)
CYTOKINESIS: division of a cells cytoplasm into two distinct cells

5. mitosis
1. Interphase 2. Prophase 3. Metaphase 4. Anaphase 5. Telophase 6. Cytokinesis

6. Meiosis
1. Interphase
2. Prophase 1
3. Metaphase 1
4. Anaphase 1
5. Telophase 1
6. Cytokinesis 1
7. Prophase 2 8. Metaphase 2 9. Anaphase Telophase Cytokinesis 2

8. The Cell Cycle (Mitosis)

9. Interphase
Growth and DNA
replication

10. Prophase Chromosomes condense Nuclear membrane begins to dissolve
Spindle fibers attach to the centromeres
Centrioles move to opposite poles

11. Metaphase Chromosomes line up at the equatorial plate Nuclear membrane
completely dissolves

12. Anaphase
Centromeres divide and the resulting chromosomes move to opposite poles of the cell
Identical chromosomes at each pole

13. Telophase Chromosomes lengthen again Spindle fibres dissolve
Nuclear membrane forms
Cytokinesis:
Cytoplasm begins to
divide
A furrow develops
pinching of the cell into
two parts
Resulting in two separate
daughter cells

14. If that seems like a lot... X X
Ana and the pro wrestlers might be up your alley... X X

15. Mitosis vs. meiosis
cells-divide.html

16. Interphase DNA has already duplicated Paternal and Maternal
Chromosomes

17. Prophase 1 Chromosomes condense
Synapsis
Chromosomes condense
Homologous chromosomes come together (Tetrad)
Crossing over occurs
Spindle fibers attach to homologous pairs

18. Crossing Over

19. Metaphase 1
Chromosomes line up at the equatorial plate

20. Anaphase 1
Homologous chromosomes separate to opposite poles

21. Telophase Nucleus completes its division.
Results in two cells that are haploid (x2)
Cytoplasm divides during cytokinesis

22. Prophase 2 Centrioles move to opposite poles
Chromosomes become attached to spindle fibres

23. Metaphase 2
Chromosomes line up at equatorial plate

24. Anaphase 2
Sister Chromatids of each chromosome separate and move to opposite poles

25. Telophase 2 Spindle fibres detach Cytoplasm separates (Cytokinesis)
Left with four haploid cells

26. Gametogenesis