Phases of the Cell CyclePgs. 246-252

Interphase – G1 Rapid growth & activity

Interphase – S Growth & DNA replication

Interphase – G2 Growth & prep for mitosis,centrioles

Prophase Chromosomes become visible

Metaphase Chromosomes line up across center

Anaphase Chromatids separate & move to ends

Telophase Nuclear division is completed

Cytokinesis Division of the cytoplasm

Interphase•Busiest part of the cell cycle•Cells make ATP•Repair themselves•Excrete wastes•Make proteins•Produce new organelles•Copy chromosomes

Prophase

• Longest phase of mitosis• Chromatin coils into

visible chromosomes• Nucleus begins to

disappear• Centrioles migrate to

opposite ends of the cell• Spindle fibers are formed

between the centrioles

Metaphase

• Shortest phase

• Chromosomes line up across the center of the cell

• Microtubules (spindle fiber) attach to centromeres

Anaphase

• Centromeres split

• Sister chromatids are pulled apart to opposite poles of the cell.

Telophase• Final phase• Nuclear envelope and

nucleous reappear• Chromosomes begin to

uncoil• Double membrane

begins to form• Nuclear division is complete

Cytokinesis (late telophase)

• Division of the cytoplasm occurs

• 2 daughter cells are formed

• Each new cell has a complete set of chromosomes

• New cell begins interphase

Cell Cycle Animation

Cell Cycle

Mitosis Video