Lecture 9 SLIDES - ANNOUNCEMENTS Monday February 8th Two...

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ANNOUNCEMENTS Monday, February 8 th Two dense chapters of reading this week. Material gets complex – be sure to keep up with reading. Handout comparing Mitosis and Meiosis will be posted on the website to help compare the two processes. Can be confusing, so be sure you understand the similarities and differences. Midterm II next Wednesday. Extra office hours in effect this Wednesday through next Tuesday. Review Session will be held Saturday, February 13 th from 7-9PM in Center115 Cell Cycle The total length of DNA in a typical cell is ~ 2 meters!! This is 250,000 X greater than the diameter of the cell! How does the cell copy this vast amount of information with every cell division?? One factor is the packaging of this DNA into chromosomes, making replication and equal distribution to daughter cells more manageable. Cell Cycle Cell Cycle Results in cell division into two genetically identical cells Cycle alternates between Interphase and Mitotic phase Cycle is regulated by molecular control system
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Why is Cell Division so important? In Unicellular organisms – Reproduction In Multicellular organisms – Development Tissue renewal – Reproduction 20 ! m 200 ! m sand dollar embryo after fertilization, forming two cells. Dividing blood cells Figure 12.2 Overview of Cell Division 1. DNA duplication ( Replication ) 2. Chromosome condensation 3. Division of chromosomes into 2 nuclei ( Mitosis ) 4. Division of the cytoplasm into 2 cells ( Cytokinesis ) All steps are highly regulated to ensure precise cell division, resulting in two identical daughter cells Overview of Cell Division Overview of Cell Division
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Overview of Cell Division
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