Mitosis and meiosis ashley

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  • 1. MITOSIS AND MEIOSIS BY: ASHLEY BULLER
  • 2. Mitosis Is nuclear division and cyotkinesis. Produces two daughter cells.
  • 3. ProphaseChromosomes arecoiled together.•Each duplication ofchromosomes are a pairof sister chromatids.•Nucleolus disappears.
  • 4. Metapha seNuclear membranecompletely disappears.Polar fiber extendcontinually from polesto the center of the cell.Chromosomes moverandomly until theyattach to the pole fibers.Chromosomes are thenaligned with the plate atright angles to thespindle poles.
  • 5. Anaphas ePaired centromerer ineach chromosomemoves apart.When they separatethey are now onechromosome, calleddaughter cells.Daughter chromosomesmove to opposite endsof the pole.The chromosomesmigrate first to theCentro mere
  • 6. Telophase Chromosomes are cordoned off into new nuclei in the daughter cells. Polar fibers are lengthening. Nucleus begin to form from opposite poles. Nuclear envelopes are formed from remaining pieces of the parent cell’s nuclear envelope. Chromatin fibers of chromosomes uncoil.
  • 7. Cytokinesis When the cytoplasm starts to divide. Divides two new nuclei into daughter cells.
  • 8. Meiosis Meiosis 1:  Chromosomes in a diploid cell resegregate.  Produces four haploid daughter cells. Meiosis 2:  Separates the chromatids producing two daughter cells and each has twenty-three chromosomes.
  • 9. Prophase 1 and 2 Prophase 1: Chromosomes become visible. Combine to form tetrads.  Contain two pairs of chromosomes. Cross over at points.  Genetic material Prophase 2: From telophase to prophase 2 without interphase. Nuclear envelope is dissolved and spindle is set up.
  • 10. Metaphase 1 and 2 Metaphase 1: Trends are arranged across the center by the kinetochores. Metaphase 2: Chromosomes move into the center. There are two chromosomes. Chromatids split off.
  • 11. Anaphase 1 and 2 Anaphase 1: Chromatids holding the chromosomes together loosens. Homologous chromatids are separated into separate poles. Anaphase 2: Kinetochores moves towards the poles. Splits the sister chromatids.
  • 12. Telophase 1 and 2 Telophase 1: Chromosomes are moved into opposite poles. Nuclear envelope reforms. Spindle is broken down. Telophase 2: Chromatids concentrate in the poles and nuclear envelope is reformed and the spindle is dissolved again. Cells divide  Leaves four haploid cells