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Mitosis: Cell Division, DNA Replication, and Chromosome Structure

Learn about the process of mitosis, DNA replication, and the structure of chromosomes. Understand why cells need to divide and the different phases of mitosis. Complete quizzes, lab activities, and oral exercises to reinforce your understanding.

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Mitosis: Cell Division, DNA Replication, and Chromosome Structure

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  1. Schedule • First Five • Mitosis Textbook Exercise/ Oral Quizzes • Clean Up • HW: All Replication QuizzesMake-up Due Fri. 02/11 • GQ: How is DNA replicated? First Five 2/7 • Pick up your DNA bag and sit with your partner. • How does the structure of DNA affect its function? (You must list 2 ideas)

  2. Schedule • First Five • Quiz and Mitosis Sheet • Mitosis Snap-beads First Five 2/11 Why do cells need to reproduce or go through mitosis? GQ: How do cells divide?

  3. Schedule • First Five • Mitosis Notes • Snapbeads • HW: • Mitosis Lab and quiz – Due Friday • Mitosis/Cell Cycle/DNA – Due Tues 2/17 • Test pkt and Test – Wed. 2/18 • GQ: How does cell division work? First Five 2/11 • Write down the four phases for mitosis. • Pick up a colored pencil bag.

  4. KEY CONCEPT Cells divide during mitosis and cytokinesis.

  5. Why do cells need to divide? Replace old and damaged cells Big cells begin to starve and lack Oxygen Big cells cannot get rid of waste or CO2 fast enough

  6. DNA andhistones SupercoiledDNA DNA doublehelix Chromatin Chromosomes condense at the start of mitosis. • DNA wraps around proteins (histones) that condense it.

  7. telomere chromatid centromere telomere Condensed, duplicated chromosome • DNA plus proteins is called chromatin. • One half of a duplicated chromosome is a chromatid. • Sister chromatids are held together at the centromere. • Telomeres protect DNA and do not include genes.

  8. Parent cell centrioles spindle fibers centrosome nucleus with DNA Mitosis and cytokinesis produce two genetically identical daughter cells. • Interphase prepares the cell to divide. • During interphase, the DNA is duplicated.

  9. Prophase  chromosomes condense and spindle fibers form. • Mitosis divides the cell’s nucleus in four phases.

  10. Metaphase  chromosomes line up in the middle of the cell. • Mitosis divides the cell’s nucleus in four phases.

  11. Anaphase  sister chromatids separate to opposite sides of the cell. • Mitosis divides the cell’s nucleus in four phases.

  12. Mitosis divides the cell’s nucleus in four phases. • Telophase  the new nuclei form and chromosomes begin to uncoil.

  13. In animal cells, the membrane pinches closed. • In plant cells, a cell plate forms. • Cytokinesis differs in animal and plant cells.

  14. Mitosis Videos • http://www.youtube.com/watch?v=pOsAbTi9tHw

  15. Schedule • First Five • Notes Mitosis • Mitosis Snapbeads • HW: • DNA Replication Quiz – Due Tomorrow • Test/Test Packet – Due Thurs 2/13 • Review – Due Wednesday 2/12 • GQ: How does cell division work? First Five 2/10 • Why do cells need to divide? (Generate 2 reasons) • Check your grade.

  16. Schedule • First Five • Mitosis Snapbeads • HW: • Mitosis Lab and quiz – Due Thursday • Review – Due Today • Test/Test Packet – Due Tomorrow • GQ: How does cell division work? First Five 2/12 • What is the form DNA takes in Interphase? • Take out your Review • Pick up a snapbead bag and colored pencil bin.

  17. Human Cells have 23 pairs of chromosomes (total 46) • Homologous chromosomes • Two chromosomes that have copies of the same genes

  18. DO NOW What is the differences between chromatin, chromatids and chromosomes Get out your planner GQ: How do cells divide?

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