Mitosis vs. Meiosis

Stand and Say - Mitosis Face your table partner Each will take a turn talking for 30 seconds about what they remember regarding Mitosis (what happens, why does it happen, etc) The listener MAY NOT TALK but should use non-verbal communication to support the “talker” Class discussion Write one question on the post-it you have about cell division and organisms reproduce and grow.

Mitosis Meiosis Meiosis

Based on the diagram, The difference between mitosis and meiosis is that mitosis produces two identical daughter cells and meiosis produces four genetically different daughter cells

Mitosis Meiosis

The numbers The cells created from mitosis are diploid or 2n. The cells created from meiosis are haploid or n Definitions: Diploid (2n) – two of each type of chromosome (in homologous pair – carry the same trait) Haploid (n) – one of each type of chromosome

The numbers Human cells have 46 chromosomes. Therefore, the diploid number (2n) of chromosomes in humans is 46. The haploid number (n) of chromosomes in humans is 23.

The reason why: mitosis To replace other cells that have been damaged or worn out To allow multicellular organisms to grow For asexual reproduction

The reason why: meiosis Meiosis results in FOUR CELLS with HALF the number of chromosomes so that when the sex cells (sperm and egg) combine, the original or normal number of chromosomes will be restored

One last thing… [the] where? Mitosis occurs in normal body cells (i.e. skin cells), and meiosis occurs in sex cells (i.e. sperm and egg) only.

Videos explanations Meiosis: Crossing Over and Variability [3D Animation] https://www.youtube.com/watch?v=rqPMp0U0HOA Nova http://www.pbs.org/wgbh/nova/miracle/divi_flash.html Amoeba Sisters https://www.youtube.com/watch?v=toWK0fIyFlY