Unit 3 Notes: Mitosis

(1) Big Ideas: Mitosis is used to make more Non-Sex cells (called Somatic Cells). 1 identical copy of original cell is made. Start with1 Cell, end with 2 identical cells. Genetic Info Stays The Same: 2n  2n or Diploid  Diploid Diploid? 2n?  Refers to the original full set of DNA.

Let’s Watch A Video… http://www.youtube.com/watch?v=VlN7K1-9QB0

(2) Mitosis Stages Prophase Metaphase Anaphase Telophase

The Parent Cell (Before Interphase of the Cell Cycle) Nucleus Un-Condensed DNA Cell Membrane

(3) Prophase “Before” Phase Chromatin condenses into chromosomes and chromosomes visible. Nuclear Membrane dissolves. Centrioles prepare to help with division.

Dissolving Nuclear Membrane Centromere Cell Membrane Sister Chromatids (Replicated DNA)

(4) Metaphase Sister Chromatids pair up at Metaphase Plate by each other’s centromere. Say What??? Sister Chromatids  Matching Segments of DNA (identical genes and alleles). Metaphase Plate  The center of the cell. Centromere  The center of a chromosome.

Pairs of Sister Chromatids Centromere Cell Membrane Metaphase Plate

(5) Anaphase Sister Chromatid Pairs Separate. Each side of the cell gets 1 copy of the genetic information!

Yes… I know this looks like a butt….. Cell Membrane Separated Chromosomes

(6) Telophase Chromosomes are completely separated. Chromosomes uncoil. Nuclear Membrane Re-Forms.

Reforming Nuclear Membrane Cell Membrane

Identical Copies! (Now that’s redundant.) The Daughter Cells (After Mitosis)

Let’s Watch A Video… http://www.youtube.com/watch?v=VGV3fv-uZYI&feature=response_watch