1. Meiosis
Division of gametes

2. Mitosis:
Somatic cells (body cells): nearly all cells in the body are diploid (2n) and have 2 sets of chromosomes – one set from each parent
Mitosis: nucleus/cell division in somatic cells
Results in 2 identical cells

3. Meiosis:
Gametes (sex cells): reproductive cells (sperm and eggs) are haploid (n) and have 1 set of chromosomes
Meiosis: nucleus/cell division in gametes, resulting in haploid cells – needed so that when the gametes join together during fertilization the zygote created is diploid
Results in four non-identical haploid daughter cells

4. Homologous Chromosomes
homologous chromosomes: chromosomes that have genes for the same traits – one comes from each parent

5. Meiosis I Meiosis I: the first division in meiosis
Prophase I: similar to prophase in mitosis
Metaphase I: the homologous chromosomes line up at the equator
Anaphase I: the homologous chromosomes separate to opposite poles
Telophase I: similar to telophase in mitosis (results in 2 haploid nuclei)

6. Crossing Over
During meiosis I, when homologous chromosomes form a tetrad, crossing over can occur.
Genetic info is exchanged between homologous chromosomes

8. Meiosis II
Meiosis II: the 2 daughter cells go through a second division (PMAT II), resulting in 4 haploid, non-identical daughter cells total.

10. Gametogenesis

11. Extra video on meiosis