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Cell growth and division

Cell growth and division. Read p. 240-245. Biology Unit 8. How do living things grow?. Why not one huge cell?. DNA would have problems getting the message out to the entire cell Hard time getting nutrients into cell Hard time getting waste products out of the cell Why?.

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Cell growth and division

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  1. Cell growth and division Read p. 240-245 Biology Unit 8

  2. How do living things grow?

  3. Why not one huge cell? • DNA would have problems getting the message out to the entire cell • Hard time getting nutrients into cell • Hard time getting waste products out of the cell Why?

  4. Volume vs Surface Area Volume L x W x # of sides 1cm cube 1x1x6=6 2x2x6=24 3x3x6=54 L x W x H 1cm cube 1x1x1=1 2x2x2=8 3x3x3=27 Surface Area Ratio 6:1 3:1 2:1

  5. Volume vs Surface Area

  6. 2 lane road…

  7. Cell Division Go small to go big!!

  8. Cell Division • Before cell divides DNA needs to be copied • 2 stages • Mitosis • Cytokinesis • Asexual reproduction in single cell organisms • Bacteria • Hydra • Both daughter cells are identical

  9. Chromosomes • Coiled DNA and proteins • Histones • Nucleosomes • Coil • Supercoil • Fruit flies have 8, humans have 46! • Before division each chromatid is replicated • Two identical sister chromatids=a chromosome • Attached at centromere

  10. Cell Cycle

  11. Cell Cycle G1, S, G2, M • G1-Growth Phase (Gap 1) • Cells grow in size • S-Synthesis Phase • DNA molecules synthesized • Chromosomes are replicated

  12. Cell Cycle Cell Cycle Video G1, S, G2, M • G2-Safety Gap Phase (Gap 2) • Cell checks for and corrects errors in the DNA copying • M-Mitotic Phase • Cell growth stops • Cell divides into two identical daughter cells • 4stages

  13. Mitotic phase • Prophase • Metaphase • Anaphase • Telophase Mitosis

  14. Mitotic phase • I • P • M • A • T • C Cell Cycle

  15. Mitotic phase • I • Purchase • Mainly • Apple • Type • Computers Cell Cycle

  16. Review • 3 reasons why a cell can’t be gargantuan? • How does surface area change relative to volume? • Is mitosis sexual or asexual? • Are the daughter cells produced by mitosis genetically different or identical? • The 2 halves of a chromosome are called this? • They are attached at a central point by? • The 4 phases of the cell cycle are? • The 4 stages of mitosis are?

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