1. DNA Part II
Unit Test is Wednesday 11/16 over Cell Division (the last part of the Unit 3 Reading Guide) We will be doing retakes/ redmediation during Advisory

2. Why do cells divide?
Identify the structures in green and blue. What are reasons you would need to make new cells? Should the new cell be identical to the original cell?

3. Cell Division in Prokaryotes and Eukaryotes
Prokaryotes lack a _____________ to hold their DNA and membrane-bound ________________, which makes division of their cells easier. The process where prokaryotic cells divide is called _______________.

4. What is the cell cycle?
Eukaryotic cells divide by _______________. Most of the time the cells is in G1, S, or G2 and is not dividing. Some cells, like your neurons, never go through cell division.

5. What happens in Interphase?
Interphase includes G1, S, and G2. In the G1 and G2 stages, the cell is growing, repairing and checking the DNA for mistakes. S phase is important because this is where DNA is duplicated. Why does the DNA need to be duplicated?

6. What are chromosomes?
You have 46 chromosomes. 23 from each parent. After duplication, each chromosome is made of two sister chromatids.

7. What is mitosis?
Mitosis means division of the nucleus. There are four stages and you will need to memorize them and what happens in each. You will also learn about special structures that are important in each stage. You can remember the acronym PMAT to help with the order of the stages.

8. Vocabulary
Centromere Homologous Chromosomes Centriole Spindle Microtubules
Center of the chromosome where the spindle fibers attach “Matching” chromosomes, one came from Ma, the other from Pa. They have the same genes, but they may have different versions. Organelle where the spindle fibers are made Fibers that attach to the chromosomes to move them around in the cell Protein that makes up the spindle fibers

9. What happens in Prophase?

10. What happens in Metaphase?

11. What happens in Anaphase?

12. What happens in Telophase?

13. What is Cytokinesis?