1. Where does my DNA Come From?

2. A new organism is produced from two parent cells
Sexual Reproduction
A new organism is produced from two parent cells

3. Types of organisms that reproduce sexually

4. Sex Cell A cell involved in sexual reproduction
It has 1/2 the number of chromosomes as a normal cell (n)
Example: human sex cells have 23 chromosomes, the rest of the human cells have 46 (2n)

5. Egg
The female sex cell
Made in ovaries

6. Sperm
Male sex cell of an animal
Made in testes

7. Pollen
Male sex cell of a plant

8. Fertilization
The fusion or combining sex cells such as egg and sperm

9. Zygote
The fertilized cell formed during sexual reproduction

11. Meiosis
A type of cell division which creates sex cells that have ½ the number of chromosomes

12. 2n 4n
Meiosis I 2n 2n
Meiosis II n n n n