10 23 09 Notes

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10 23 09 Notes

  1. 1. Notes 10/23/09 Exam answer keys: 3rd floor Centennial (Lockhart Hall), biology computer lab. Cell division functions in reproduction -Reproduce -Growth (ex. baby -> child -> teen -> adult) -Repair (ex. cuts) Cell division distributes identical sets of chromosomes to daughter cells. -Chromatin (what chromosomes look like when you can’t tell one from another) -Chromosomes (greek – chroma, colour / somes, body). 2 sister chromatids = chromosome. 2 separate identical strands of DNA. Condensing => coil up <- same as: Mitosis: purpose is so that copies of chromosomes can be made -Centromere: Protein that holds two copies of DNA together. -Chromatid: each copy of DNA molecule. Cellular organization of genetic material: -Genome => a cell’s endowment of DNA, it’s genetic material. -Chromosomes => eukaryotic genomes usually consist of a number of DNA molecules, packaged together. Human Genome Project => map of genes on chromosomes. Prokaryotic = bacterial cells Eukaryotic = complex, larger cells Chromosome duplication and distribution during cell division
  2. 2. The Cell Cycle -Interphase -G1 – phase when cell is doing its job Trigger to begin division S1 – Copy DNA G2 – Preparation for division -DNA Synthesis -Mitotic phase Interphase -> Mitosis The Mitotic Cell Cycle -The mitotic phase alternates with interphase in the cell cycle. --G1 phase, S phase, G2 phase. --Prophase, metaphase, anaphase, telophase. -The mitotic spindle distributes chromosomes to daughter cells. Interphase (page 130-131) ---draw diagrams, label, describe, multiple times to remember— Centrosomes— makes microtubules, creates spindle apparatus. Centromere—
  3. 3. Rewatch final 10 minutes of lecure.

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