1. Mitosis and Meiosis
When Cells Divide

2. When Do Cells Divide? Cell reaches maximum size. Growth Repair
Reproduction

3. Two Types of Reproduction
Asexual: One parent.
EX: Bacteria, Fungi, some plants, & some animals.
Offspring is genetically identical to their parent
Sexual: Genetic material from two parents.

4. Meiosis
Cellular reproduction in which the number of chromosomes is reduced by half, so that the daughter cells are haploid.

5. Assessment
In your notebook, define the term haploid, using your own words.
If 2n = 46, what is the value of n?

6. Meiosis Humans have 46 chromosomes. (23 pairs)
Diploid: Cell that contains two complete sets of chromosomes. (2n)
Almost all the cells in your body are diploid.

7. Assessment
Give three examples in your body where you have diploid cells.

8. Haploid Cells Cells that contain only one set of chromosomes (n).
Egg and Sperm cell are haploid
Gametes

9. Homologous Chromosomes
23 pairs of chromosomes.
Females = XX
Males = XY

10. Meiosis I and Meiosis II
Each stage has four parts to it.
1 cell becomes 4.
Meiosis I creates 2 diploid daughter cells.
These go on to Meiosis II, now have 4 haploid cells.

11. Meiosis
Meiosis Video

12. Mitosis or Meiosis??? 1. Asexual Reproduction? ____
2. Results in 2 identical cells? ____
3. Results in 4 non-identical cells? ____
4. Produces gametes? _____
5. Results in variation? _____
6. Results in haploid cells? _____
7. Used for growth and repair? _____
8. Skin cells? _____
9. Sperm cells? _____

13. Mitosis or Meiosis??? 1. Asexual Reproduction? ____Mitosis_
2. Results in 2 identical cells? ___Mitosis__
3. Results in 4 non-identical cells? __meiosis___
4. Produces gametes? ___Meiosis__
5. Results in variation? ___Meiosis__
6. Results in haploid cells? ____Meiosis_
7. Used for growth and repair? ___Mitosis__
8. Skin cells? ___Mitosis__
9. Sperm cells? ____Meiosis_