9.3 Cell Division

 The Cell Cycle M phase G2 phase S phase G1 phase Section 10-2

At the end of G2 Mitosis begins – Mitosis is divided into 4 Phases 1. PROPHASE: Nuclear membrane begins to disappear DNA condenses and chromatids come together to form Chromatid pairs (aka sister chromatids) held together by the Centromere Centrioles appear, migrate to the cells pole and spindle fibers appear

Spindle Fibers: framework of microtubules that guide the movement of chromosomes during mitosis and meiosis.

PROPHASE

2. METAPHASE All the chromosomes are in a plane (line) in the middle of the cell. Spindles are fully formed and attached to the chromosomes at the centromeres

3. ANAPHASE In anaphase, chromatid pairs separate as the spindle fibers pull them apart and toward each pole

4. TELOPHASE Chromatid begin to unwind and relax Nuclear membrane reforms Telophase continues until the cells split The process of cells actually splitting is called cytokinesis.

Modeling Mitosis With Playdoh Materials: Five paper plates 4 different playdoh colors Procedure: Assign a playdoh color to represent Mother’s chromosome_____________ Father’s chromosome______________ Centrioles_______________ Spindle Fibers_______________ 2. Label each plate to represent the four stages of mitosis (PMAT) and cytokinesis 3. Use the graphics in the mitosis powerpoint or from chapter 9 in iBooks to model the stages of mitosis using the playdoh 4. When all five plates have completed models please use your phone (or my phone) to take a picture and upload the photo to notability. Once the photos are in notability please label the chromatids, sister chromatids (if present), centrioles, and spindle fibers.