1. Meiosis
Page

2. Cell Cycle & Reproduction
Sexual reproduction results in offspring that inherit genetic information from two parents.
Sexual reproduction is more time consuming (finding a mate, growth & development of offspring), but it provides genetic diversity, which is an advantage when conditions change.

3. Organisms have pairs or sets of chromosomes (so humans have 2 sets of 23 chromosomes)

5. Important Vocabulary
Homologous chromosome – pair of identical chromosomes
Autosomes-Chromosomes not sex determining.
Sex chromosomes- determine sex

6. 4 . Diploid – When a cell had both sets of chromosomes it is a diploid cell.=2n
5. Haploid -When a cell only has one or half set of chromosomes it is a haploid cell. n

7. Mitosis
# of divisions 1
Type of cells
somatic
Sets of chromosomes
2 (Diploid)
# of cells 2
Resulting cells:
Identical
Stages
Prophase, Metaphase, Anaphase, Telophase

8. Meiosis
Meiosis is how gametes or haploid cells divide (it is how egg and sperm cells are created). There are 2 divisions, resulting in 4 unique cells. This is the basis for gentic diversity.

9. Meiosis 1 Meiosis 1: Stages
Prophase I, Metaphase I, Anaphase I, Telophase I , Cytokinesis
Crossing Over
Exchange of segments of DNA between homologous chromosomes (During prophase 1)
Independent Assortment
Random assortment or lining up of chromosomes during metaphase 1.

10. Draw and label crossing over (pg 190)

11. Meiosis 1: Draw and label the stages of meiosis 1 (pg 174)

12. Meiosis 2
Meiosis 2
DNA
DNA is not copied between meiosis 1 and 2. This is how haploid cells are formed.
Stages
Prophase 2, Metaphase 2, Anaphase 2 and Telophase 2 , Cytokinesis
Gamete formation
There are differences between the development of egg and sperm cells.

13. Draw and label Meiosis 2 on page 175

14. Mitosis vs. Meiosis
Mitosis
Meiosis

15. Compare / Contrast Mitosis and Meiosis
# of divisions 1 2
Type of cells
somatic
gametes
Sets of chromosomes
2 (Diploid)
1 (haploid)
# of cells 4
Resulting cells:
Identical
Unique
Stages
Prophase, Metaphase, Anaphase, Telophase
Prophase 1, Metaphase1 , Anaphase1 , Telophase1, Prophase 2, Metaphase 2 , Anaphase,2 Telophase2