1. The OTHER way to divide

2. Meiosis Meiosis is another process of cell division. It is very similar to Mitosis and shares the divisional phases. Unlike Mitosis the genetic material being divided is similar but NOT exactly identical

3. Mitosis (Short Simple and Sweet) Cell division of Diploid cells Cells that are created are exact copies of the original. The Mother Cell creates 2 Daughter Cells with the same amount of Chromosomes (2N) as the original.

4. Mitosis (Short Simple and Sweet) Interphase consists of 4 Phases: G1, S, G2 and G0 During interphase cell grows in size and determines if it can begin Mitosis. Mitosis follows Interphase and consists of 4 Phases: Prophase, Metaphase, Anaphase and Telophase

5. Mitosis Cycle Prophase: Chromosomes condense Body spindles relocate, Nucleus dissolves Metaphase: Chromosomes align at Equator Anaphase: Chromatids separate and head to opposite poles Telophase: Chromatids reach poles and cell pinches creating two daughter cells

6. The Stages of Meiosis

7. Meiosis Meiosis is used during sexual reproduction. Meiosis uses Haploid cells from a mother and father to create the first human cell. The mother donates the Oocyte (egg cell) The Father donates the Spermacyte (sperm)

8. Meiosis Meiosis uses the same 4 Phases as Mitosis but it goes through the division process 2x Meiosis I Prophase, Metaphase, Anaphase, Telophase Meiosis II Prophase II, Metaphase II, Anaphase II and Telophase II

9. The Beginning The Cell begins by combining 23 Chromosomes from the mother (oocyte) and father (spermacyte) The Newly developed Cell has 46 Chromosomes (2N) @ Interphase

10. Prophase During Prophase the Chromosomes duplicate and join in homologous pairs. Homologous Chromosomes – Chromosomes of similar size, length and shape that display the same genes.

11. 23 Homologous pairs

12. Prophase After Joining in Homologous pairs the cells then begin to Crossover

13. During Metaphase the Homologous pairs align at the Equator and stick near their matching counterpart. During Anaphase one of the haploid pairs get pulled to a different pole

14. During Telophase the chromosomes are enclosed in the nuclear membrane but do not untangle

15. Meiosis II Follows shortly behind Meiosis I The process is similar to mitosis with different genetic results. There is NO Crossover or Chromosome Duplication!!!! The end result is production of four haploid cells (23 chromosomes, N) from the two haploid cells produced in meiosis I.

16. Crash Course Meiosis