10.1 Cell Growth, Division and Reproduction - PowerPoint PPT Presentation

kami
10 1 cell growth division and reproduction n.
Skip this Video
Loading SlideShow in 5 Seconds..
10.1 Cell Growth, Division and Reproduction PowerPoint Presentation
Download Presentation
10.1 Cell Growth, Division and Reproduction

play fullscreen
1 / 16
Download Presentation
10.1 Cell Growth, Division and Reproduction
474 Views
Download Presentation

10.1 Cell Growth, Division and Reproduction

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. 10.1 Cell Growth, Division and Reproduction

  2. Limits to Cell Size • Large cells, more demands • What is information overload? • Exchanging materials • Surface area to vol. ratio • Trouble getting in and out • Cell Division – 2 daughters

  3. Cell Division and Reproduction • Asexual Reproduction • One parent • No Fuss, No Muss • Quick and Efficient (Survival) • Sexual Reproduction • Two Parents • Gametes (sex cells) • Genetic Variation • Limit seasonal reproduction

  4. 10.2 The Process of Cell Division

  5. Chromosomes • Why is it necessary for cells to have their info bundled? • What is the role of the chromosome in cell division? • To separate DNA precisely during cell division • Prokaryotic vs. Eukaryotic Chromosomes • Amt. of DNA – Where located • DNA Coils • Histone proteins

  6. The Cell Cycle • Grows • Prepares for Division • Divides (two daughter cells) • Prokaryotes • Rapid (binary fission) • Copy DNA (when they reach a certain size)

  7. The Cell Cycle • Eukaryotes • Four phases • G1 phase • Cell Growth • S phase • DNA replication • G2 phase • Prep for Mitosis • M phase • Mitosis and Cytokinesis

  8. Mitosis • Prophase • Condense, chromosomes visible, spindle • Centromere (chrom. Attach.) • Chromatid (sisters) • Centrioles (related to spindle)

  9. Mitosis • Metaphase • Centromeres line up in the center • Spindles attach to centromeres • Two poles • Anaphase • Chromatids separate • Move to opposites ends

  10. Mitosis and Cytokinesis • Telophase (end of mitosis) • Opposite of Prophase • Chromosome spread out • Nuclear envelope reappears • Spindle breaks up • Nucleolus reappears • Cytokinesis • Div. of cytoplasm • Plants vs. Animals Animal Cell Plant Cell

  11. 10.3 Regulating the Cell Cycle

  12. Controls on Cell Division • Regulated by Proteins • When you have an injury cells must divide to repair • Regulatory Proteins or cyclins. • Internal regulators • External regulators • (IR) Make sure chromosomes are duplicated • (IR)Programmed cell death • Apoptosis • Development • Parkinson’s • (ER) Growth Factors – due to injury • (ER) Growth Inhibitors so cells do not get too crowded

  13. Cancer: Uncontrolled Cell Growth • Disorder where cells lose control of growth • Do not respond to normal signals • Tumor – not all are cancerous • Malignant or Benign • Defective genes (p53) • Treatments • Local, radiation, chemotherapy

  14. 10.4 Cell Differentiation

  15. From One Cell to Many • Embryo – Developmental stage • Differentiation – cells specialized • Can be mapped • Determines when a cell becomes specialized • Mammals have factors that give them flexibility as to when specialization occurs

  16. Stem Cells and Development • Types of cells in Development • Totipotent (all cells) • Blastocyst forms • Inner cell mass • Pluripotent (most cells) • Embryonic stem cells • Multipotent (many types) • Adult stem cells • Depends on where the come from