Meiosis.

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Presentation transcript:

Meiosis

Meiosis A type of cell division that produces four cells each with half the number of chromosomes as the parents Homologous Chromosomes: Two pairs of chromosomes that carry the same genetic material

Haploid and Diploid Haploid Diploid A cell with a single set of chromosomes Shown as n A human has 23 chromosomes Diploid A cell with two sets of chromosomes Shown as 2n A human has 46 chromosomes as 2n

Produces 4 genetically different haploid cells Has two division stages Meiosis Produces 4 genetically different haploid cells Has two division stages Meiosis I Meiosis II

Meiosis

Meiosis I Prophase I Creation of homologous chromosomes Tetrads are formed Homologous chromosomes crossover

Meiosis I Metaphase I Anaphase I Telophase I and Cytokinesis Tetrads line up Anaphase I Homologous chromosomes separate Telophase I and Cytokinesis Cells separate with homologous chromosomes

Meiosis I

Meiosis II Prophase II Metaphase II Anaphase II Sister Chromatids Line up Anaphase II Sister Chromatids separate Telophase II and Cytokinesis Cells split and create haploid genetically different daughter cells

Meiosis Creates four genetically different daughter cells Crossing over creates genetic variation Only sex cells go through meiosis Gamete: A sex cell created by meiosis- Sperm or Egg

Mitosis VS. Meiosis Mitosis Meiosis Creates 2 identical daughter cells Does not exchange or change genetics One stage Diploid Meiosis Creates 4 genetically different daughter cells Exchanges or changes genetics through crossing over Two stages Haploid