March 10th,2011 CJS

Today, to start off class we seperated into groups and discussed the classwork from yesterday. The classwork was that we had to read and anwser the questions on page 97 in the science textbook. The questions had to deal with looking at a graph which distributed the time of cell divison. Also, we had to design an experiment which had to deal with testing to see if cell divison happened faster in hotter temperatures. Then Mr. Finley started to go into detail about what happens in each stage of cell divison which are prophase, metaphase,anaphase, and telophase. First, we started with prophase. in the beginning of prophase, the nucleus breaksdown and dissapears. Then, the chromomatin coils up and turn into a chromosones.. A chromomatin is a strand of dna. Chromosones are dna coiled up. The last thing that happens in prophase is that the centrioles move to the opposite ends of the cell. Centrioles start to create spindle fibers as well. There are only two centrioles in the cell. Then we talked about metaphase. The first thing that happens in metaphase is that the spindle fibers get fully created. Next, the centrioles shoot out spindle fibers. Then, the spindle fibers connect to the chromosones in the kinetocore(centromere). A centromere(kinetocore) is the middle of the chromosone. Then the spindle fibers line up the chromosones in the middle of the cell. Then the next stage in the cell cycle is Anaphase. To start anaphase the spindle fibers pull the chromosones apart to opposite sides of the cell and they slowly start to break apart. Then telophase happens. In telophase the nucleaus starts to reform again. Then, the last part of telophase is if it is a plant cell it forms a cell wall and if it is an animal cell the membrane starts to break apart. Then class ended and that is where are notes for the day stopped.

CJS