1. KEY CONCEPT Cells divide during mitosis and cytokinesis.

2. DNA- double stranded molecule made of four different subunits of nucleotides (A,T,C,G)
Chromosome- one long continuous thread of DNA
Each body cell has 46 chromosomes in 23 pairs

3. Chromosomes condense at the start of mitosis.
DNA wraps around proteins (histones) that condense it.
DNA double helix
DNA and histones
Chromatin
Supercoiled DNA

4. One half of a duplicated chromosome is a chromatid.
Sister chromatids are held together at the centromere.
Telomeres protect DNA and do not include genes.
Old DNA New DNA
Pg. 58

5. Interphase prepares the cell to divide (G1, S, G2)
During interphase, the DNA is duplicated.
Parent cell
centrioles
spindle fibers
centrosome
nucleus with
DNA
*Not part of mitosis

6. Mitosis divides a Somatic (body) cell’s nucleus in four phases.
Prophase: chromosomes condense and spindle fibers form.

7. Metaphase: chromosomes line up in the middle of the cell.

8. Anaphase: sister chromatids separate to opposite sides of the cell.

9. Telophase: the new nuclei form and chromosomes begin to uncoil.

10. Cytokinesis differs in animal and plant cells.
In animal cells, the membrane pinches closed.
In plant cells, a cell plate forms.

11. How can you remember what goes first?
Peter Made A Tiger Cry

12. A toe is part of your body
Tip to Remember
Mitosis = Mi “TOE” sis
A toe is part of your body
MITOSIS only occurs in your Somatic or BODY cells
Every cell EXCEPT sperm and eggs