Mitosis

The Cell CYCLE consists of Interphase and MITOSIS (division of the nucleus). Most of the time the cell is in INTERPHASE as the cell prepares for division.

G1S

G2 M C

INTERPHASE1.The cell’s chemical

machine operates and the cell grows (G1 phase).

2.The SYNTHESIS of DNA (S phase).

3.PREPARE for cell division

MITOSIS1. The chromatin CONDENSES (shortens) into

chromosomes.

Chromatin vs. Chromosomes

•Long/thin

•Invisible

•Active

•Working cell

•Short/thick

•Visible

•Inactive

•Dividing cell

2.The nuclear membrane and nucleolus DISAPPEAR.

3.Centrioles move apart to opposite ends of the cell.

4.SPINDLE fibers from the centrioles attach to centromeres.

Chromosomes

Metaphase

1. Chromosomes line up on the EQUATOR of the cell.

Anaphase

1.Centromere SPLITS.

2.Chromosomes are PULLED to the ends of the cell.

Telophase

1. Chromosomes ARE AT the ends of the cell.

2. Chromosomes DECONDENSE (lengthen) to form chromatin.

3. The nuclear membrane and nucleolus REAPPEAR.

4. The centrioles SEPARATE.

5. The CYTOPLASM is divided. (Cytokinesis)