W EDNESDAY : M ARCH 10, 2010 Have a seat, clear your desk, take out a writing utensil… OBJECTIVES: What happens during each phase of mitosis. What does the cell look like during each stage of mitosis. DUE: Section 9.1 assessment questions HOMEWORK: Read section 9.2 and answer assessment questions #1-5 on p. 252 Complete cell cycle worksheet as well.

Cell Cycle InterphaseMitosis Cytokinesis G1 S-Synthesis G2 Prophase MetaphaseAnaphase Telophase EUKARYOTIC cells reproduce by: mitosis : the process of nuclear division and cytokinesis : the process of cytoplasm division PROKARYOTIC cells reproduce by a method called binary fission.

C LOSER L OOK AT C HROMOSOMES … DNA CHROMOSOME CHROMATIN SISTER CHROMATID CENTROMERE

PROPHASE Nuclear membrane disintegrates Nucleolus disappears Chromatin (relaxed form of DNA) condenses into chromosomes Chromosomes in prophase are actually sister chromatids that are attached at the centromere. Centrioles migrate to pole ends of the cell and microtubules form.

METAPHASE Chromosomes attach to mitotic spindle and align along equator of cell

ANAPHASE Microtubules shorten, moving chromosomes to opposite poles.

TELOPHASE Sister chromatids reach poles of cell Nuclear envelope re-develops Chromosomes decondense

CYTOKINESIS In animal cells, cleavage furrow forms at equator of cell and pinches inwards until cell divides in two. In plants, a cell plate forms dividing daughter cells into two