- Male and female gametes (egg and sperm) combine to form a zygote.
- Gonads are organs that produce gametes (male: testes, female: ovaries)
- Embryos→ fetus→ infant
- growth through cell division and differenciation
- Cell division of somatic cells (non-sex cells).
- Puberty: parts of body begin to be able to make sex cells
- Meiosis: make more gametes