Lesson Plan : Cell division part 1

Teacher Name:
 Grade 9-10

 Despite differences between prokaryotes and eukaryotes, there are several common features in their cell division processes. Replication of the DNA must occur. Segregation of the "original" and its "replica" follow. Cytokinesis ends the cell division process. Whether the cell was eukaryotic or prokaryotic, these basic events must occur.
 TSWD the understanding of the terms and process involved with cellular replication.
 Students will demonstrate understanding by drawing and labelling the stages of fission and mitosis.
 Unlined paper (1 sheet), colored pencils, pencil, crayons, light microscope, slides, cover slips, onion (fresh), toothpicks, knife (used by teacher only), iodine stain, overhead projector.
 Prokaryotic Cell Division Prokaryotes are much simpler in their organization than are eukaryotes. There are a great many more organelles in eukaryotes, also more chromosomes. The usual method of prokaryote cell division is termed binary fission. The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane. When the cell begins to pull apart, the replicate and original chromosomes are separated. Following cell splitting (cytokinesis), there are then two cells of identical genetic composition (except for the rare chance of a spontaneous mutation). Eukaryotic cells Due to their increased numbers of chromosomes, organelles and complexity, eukaryote cell division is more complicated, although the same processes of replication, segregation, and cytokinesis still occur.
 Boardwork and or overhead projector. Illustrate the stages of division and ky vocabulary.
 Procedure Part A: Slide Preparation Onion Skin a. First take a piece of onion skin off the onion. b. Put it flat on a slide. c. Bring the slide to the leader for a drop of iodine stain. d. Carefully put on a cover slip remembering to angle it. e. Examine the cell under low then medium power. f. Adjust your microscope to a higher power.
 Prepare slides if needed.
Checking For Understanding:
 Have students restate lesson throughout. Check slide preps, illustrations and discriptions.
 Check for understanding by questioning the main points covered.

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