Cell Division

The Cell division topic and the stages of it.

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  • Created by: Bertimo
  • Created on: 25-02-14 19:26
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  • Cell Division
    • Cell Cycle (I Prefer Men And Tea)
      • Interpahse
        • Oganelles divide for the new cell
        • The stage most cells are in
        • The cell increases in size
        • DNA is replicated
        • Each chromosome consists of a pair of chromotids
      • Prophase
        • Chromosomes shorten and thicken by spiralisation
        • Centrioles move to the opposite poles of the cell
        • mircotubules radiate from the centrioles
        • Nuclear membrane disintergrates
      • Metaphase
        • Chromosomes line up in single file at the equator of the cell
        • Chromosomes become attached to the spindle fibers by their centromeres
      • Anaphase
        • This is the fastest stage
        • The centromeres split in two so chromotids are seperated
        • The spindle fibers pull the daugheter centromeres to opposite poles
      • Telophase
        • Chromosomes reach the opposite poles of the cell, uncoil and lengthen
        • Spindle fibers desintergrate
        • Nuclear membrane reforms and leads to cytokinesis
      • Produces genitally identical daughter cells (Diploid)
    • Definistions
      • Chromosome - Contains one est of genetic information
      • Chromotid - Half of a double chromosome, bound by a centromere
      • Centormere - The part of the replicated chromosome, holding the two chromotids together
    • Extra Information
      • Mitosis is for growth, cell replacement, regeneration and asexual reporduction
      • Meosis
        • The cell divides twice, not once
        • Used to make gametes
        • Produces 4 daughter cells, with half the genetic material to maintain genetic stability
        • Produces haploid cells
    • DNA Replication
      • First DNA helicase 'unzips' the two DNA strands, exposing the bases
      • Next DNA polymerase moves along the exposed bases and creates a new complementary strand as it goes
      • Then BAM you have two strands of DNA!

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