Discuss with your neighbor, how you started as one cell and are now made up of over 3 trillion cells.

Controls when cells are supposed to divide. The Cell Cycle Controls when cells are supposed to divide.

What is a cycle?

cy·cles plural1.  repeated sequence of events: a sequence of events that is repeated again and again, especially a causal sequence

Chromosomes Chromosomes are made up of DNA They have 2 sister chromatids Chromatids are attached by a centromere. 1 Sister Chromatid Centromere

The Cell Cycle The cell cycle consists of four phases: G1 phase S phase G2 phase M phase INTERPHASE:is made up of G1, S, and G2 phases Cell Division: is also known as M phase. Cell division is made up of Mitosis and Cytokinesis.

G1 Phase G1 phase is where cells: Are increasing in size Making new proteins

S Phase S phase is where: Chromosomes are replicated DNA is being made

G2 Phase G2 phase is where: Organelles are being produced Cell is preparing for mitosis

M Phase M phase is where: The cell begins the process of dividing. Prophase Metaphase Anaphase Telophase Cytokinesis

Cancer Cancer- is uncontrolled cell growth. How are the cell cycle and cancer related?

Checkpoint Animation http://outreach.mcb.harvard.edu/animations/checkpoints.swf

Think-Pair-Share Why do your cells divide? How do your cells know when to divide? Are your cells the same size as they were when you were 2 years old?