1. Meiosis
MEIOSIS
and sexual life cycles

2. Sexual Reproduction (animals)
Gamete
Gamete
Fertilization
(n + n  2n)
Mitosis produces subsequent somatic cells
Meiosis
(2n  n + n + n + n)
Zygote
Gametes

3. Meiosis I – homologous pairs separate
Synapsis
Homologous chromosomes form tetrads
Chiasmata may result
Paternal and maternal chromatids recombine (cross over)

4. Meiosis I – homologous pairs separate

5. Meiosis II –pairs separate

6. Independent Assortment
Crossing Over
Independent Assortment

7. Independent Assortment
Crossing Over
Independent Assortment

8. Summary Comparison

9. Animal Sexual Life Cycle
MEIOSIS
FERTILIZATION n 2n

10. Fungal/Protist Sexual Life Cycle
MEIOSIS
FERTILIZATION n 2n

11. Plant Sexual Life Cycle
MEIOSIS
FERTILIZATION 2n n