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Warm up – 3-2-1 Countdown

Warm up – 3-2-1 Countdown. 3 – What are three differences between photosynthesis & respiration? 2 – What are two similarities between photosynthesis & respiration? 1 – What is the relationship between the two processes?. Warm up - Photosynthesis.

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Warm up – 3-2-1 Countdown

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  1. Warm up – 3-2-1 Countdown 3 – What are three differences between photosynthesis & respiration? 2 – What are two similarities between photosynthesis & respiration? 1 – What is the relationship between the two processes?

  2. Warm up - Photosynthesis • Identify the missing raw materials and products of photosynthesis: 4. 3. 1. 2. BrainPop Video - Photosynthesis

  3. Cell Division

  4. Cell Division Amoeba Sisters – Mitosis video WHY do cells divide (make more cells)? • To grow • To replace dead cells • To repair damaged cells

  5. Human Development • So, the division of cells is how we become multicellular!

  6. Cell Division/ Cell Cycle • Asexual reproduction – reproduction involving one (or a) parent cell • Cell division– a type of asexual reproduction where one cell divides and becomes two identical copies of itself. • Mitosis – a special part of cell division where the nucleus of the cell makes a copy of itself and then divides into two new nuclei.

  7. The Cell Cycle Foldable: • Tape the blank papers in the format on the next page. • Label each paper. • Draw arrows. • Write notes under each flap (from the PPT). • Illustrate each step on the cover of each flap.

  8. 1. Interphase 2a. Mitosis: Prophase 3. cytokinesis The Cell Cycle Pgs. 90-91 2d. Mitosis: Telophase 2b. Mitosis: Metaphase 2c. Mitosis: Anaphase

  9. BrainPop video clip: Mitosis

  10. 1. Interphase • Longest stage • Cell grows • Chromosomes are copied • Chromatids – the two chromosome copies • Centromere – region where chromatids are held together

  11. Chromosomes

  12. Mitosis - overview • Mitosis – process of cell division that forms two new nuclei, each of which has the same number of chromosomes. • 4 phases: • Prophase • Metaphase • Anaphase • Telophase

  13. 2a. Mitosis (Prophase) • Prophase = chromosomes “pair” up with their copy. • Prophase= chromosomes “pair” up with their copy. • Chromosomes twist, coil & condense into an “X” shape • Spindle fibers form • Nuclear membrane begins to break down

  14. 2b. Mitosis (Metaphase) • Nuclear membrane disappears • Chromatid pairs line up in the middle of the cell • metaphase = middle

  15. 2c. Mitosis (Anaphase) • Chromatids separate • Chromatids move apart to opposite sides of the cell • anaphase = apart • Cell becomes stretched

  16. 2d. Mitosis (Telophase) • Two nuclear membranes form around each set of chromosomes • telophase = two new nuclear membranes • Mitosis is over

  17. 3. Cytokinesis • Cell divides in two • Cells without a cell wall (ex: animal cells): • Cell pinches in two • Cells with a cell wall (ex: plants): • A cell plate forms between the two new cells

  18. Demo of Mitosis • See “Cells Alive” video/demo • http://cellsalive.com/mitosis.htm

  19. WARM UP:Which phase of the cell cycle? • Interphase • Telophase • Anaphase • Metaphase

  20. Place the following Cell Cycle illustrations in order: A B C E D F

  21. Cell Cycle/Mitosis Review • BrainPop - Mitosis

  22. How many cells? How many chromosomes? (TOC #44) PARENT CELL Example: Human Skin Cell 46 Interphase– chromosomes are copied 92 Prophase - pair up Metaphase– middle Anaphase – apart Telophase – two nuclei Cytokinesis – cell splits in 2 46 46 DAUGHTER CELLS

  23. Review Question: A cell with 10 chromosomes undergoes mitosis and cell division. How many daughter cells are produced and what number of chromosomes do they have? • 2 daughter cells, 5 chromosomes each • 1 daughter cell, 10 chromosomes each • 4 daughter cells, 20 chromosomes each • 2 daughter cells, 10 chromosomes each

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