1. Sexual Reproduction

2. Sexual Reproduction Two sex cells come together
Sperm: male sex cell
Egg: female sex cell
Fertilization forms zygote
Zygote is immature form that will develop into new organism

3. What sorts of organisms do sexual reproduction?

4. Normal body cells Normal cells are diploid
Diploid means paired
Every body cell has a pairs of similar chromosomes
Humans: 23 pairs of chromosomes
Tigers: 18 pairs of chromosomes
Fruit flies: 4 pairs of chromosomes

5. Karyotype

6. Sex cells
Sex cells must have half the normal number of chromosomes for that organism
Haploid: means single form
Why?
When egg and sperm come together, the zygote has the normal number of chromosomes
Because there are genes from two different parents, there is variation

7. Meiosis Also called reduction division Process of making sex cells
Result: haploid cells