1. Chapter Meiosis

2. Chromosomes Chromosomes store DNA as genes 23 pairs chromosomes
22 pairs autosomes
1 pair of sex chromosomes
Body cells are diploid
1 set from mom & 1 set from dad

3. Homologous Chromosomes: chromosomes paired
Chromosomes (cont.)
Homologous Chromosomes:
chromosomes paired
Ex. You have two chromosome #1

4. Gametes
Sperm & egg are haploid (1 set of chromosomes)
WHY?

5. Meiosis Process of form gametes Two stage division:
1st division reduces chromosome #
2nd division separates chromatids

6. Steps of Meiosis

7. Steps of Meiosis

8. Where Meiosis Occurs
Testes form sperm
Ovaries form eggs

9. Crossing Over
Exchange of genetic pieces
Leads to genetic diversity

10. Fertilization
When gametes combine they form a zygote

11. Comparing Meiosis & Mitosis
Both have similar stages
Ex: Interphase, Prophase, Metaphase, etc.

12. Contrasting Meiosis & Mitosis
Mitosis results in two cells each with 46 chromosomes
Meiosis results in four cells each with 23 chromosomes

13. Mitosis vs. Meiosis