Meiosis Division of sex cells. Meiosis Cell Division to make 4 new, genetically different sex cells.

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Presentation transcript:

Meiosis Division of sex cells

Meiosis Cell Division to make 4 new, genetically different sex cells.

Gametes = Sex Cells Sperm (male) Egg (female)

Gametes Haploid (n) = ½ the number of chromosomes Important for fertilization –Egg + Sperm = Baby –½ + ½ = 1 full set of chromosomes

Somatic Cells = Body Cells Diploid (2n) = Full set of chromosomes –½ from Mom –½ from Dad

Human Gamete = Haploid = 23 chromosomes Human Somatic Cell = Diploid = 46 chromosomes

Stages of Meiosis Meiosis can be thought of as mitosis twice –Meiosis I: Separation of Homologous Chromosomes –Meiosis II: Separation of Sister Chromatids

Meiosis I 1.Prophase I Crossing over occurs 2. Metaphase I 3.Anaphase I Homologous chromosomes separate 4.Telophase I Cytokinesis occurs

Crossing Over Interchanging of pieces of DNA Changes the chromosome!

Meiosis II 1.Prophase II 2.Metaphase II 3.Anaphase II Sister chromatids separate 4.Telophase II Cytokinesis occurs

End Product 4 Genetically Different Gametes

Meiosis Animation

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