1. Meiosis

2. Meiosis
Meiosis is a process of nuclear division that reduces the number of chromosomes in new cells to half the number in the original cell.
Meiosis leads to four haploid cells (gametes) rather than two diploid cells as in mitosis.

3. Meiosis I
Meiosis I includes prophase I, metaphase I, anaphase I, and telophase I.
Crossing-over, which is when portions of homologous chromosomes exchange genetic material, occurs during prophase I and results in genetic recombination.

4. Meiosis I
Prophase I – chromosomes become visible, pairs meet, crossing over occurs so sister chromatids are no longer indenticle
Metaphase I – pairs of chromosomes line up

5. Meiosis I Anaphase I – chromosome pairs are separated
Telophase – haploid cells with duplicated chromosomes are produced

6. Meiosis II
Meiosis II includes prophase II, metaphase II, anaphase II, and telophase II.
Four new haploid cells result.

7. Meiosis II Prophase II – chromosomes remain visible
Metaphase II – chromosomes line up in the center of the cell

8. Meiosis II Anaphase II – sister chromatids are pulled apart
Telophase II – four haploid cells that are not identical are created.

9. Comparing Mitosis and Meiosis

10. Development of Gametes
Spermatogenesis is the process by which sperm cells are produced.
Oogenesis is the process that produces mature egg cells.