1. Cell Division

2. Importance of Cell Division
Reproduce to make new organisms
Allow multicellular organisms to Grow
Replace the old worn-out cells
Repairing damage

3. Asexual Reproduction Only 1 organism is needed!!
Fission – Cell splits apart (bacteria)
Budding – New organism grows on the body of its parent (hydra)
Regeneration – Ability to re-grow lost or damaged parts (planarian)

5. Mitosis Nucleus divides (one time) to form 2 identical cells
Type of asexual reproduction

6. Stages of Cell Cycle

10. Sexual Reproduction
Involves the exchange of genetic information between
2 organisms
This creates a brand new, genetically unique organism

11. During fertilization sex cells (egg & sperm) combine to produce a zygote that will develop into a new organism

12. Types of cells Diploid – cells with pairs of chromosomes (body cells)
Haploid – have only one of each chromosome (sex cells)

13. Human diploid cells have 23 pairs of chromosomes (46 total chromosomes)
Human haploid cells only have 23 chromosomes

14. Each haploid cell contains half the number of chromosomes as their parent cell
46  23

16. Meiosis One diploid cell divides and makes four haploid sex cells
Involves two divisions of the nucleus and cytoplasm
Meiosis I & Meiosis II

17. Meiosis I

18. Meiosis II

19. Meiosis Video:

21. Mitosis Meiosis 1 Division that produces 2 daughter cells
2 Divisions that produces 4 daughter cells
Same # of chromosomes as the parent cell (diploid)
Half the chromosomes of the parent cell (haploid)
Genetically the same
Genetically different combinations
Help humans to grow and repair
Used for sexual reproduction