Cell division

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Cell division

  1. 1.  Theprocess by which a cell divides into two or more cells. Cell division is also the source of tissue growth and repair in multicellular organisms
  2. 2. Somatic cellSex cell
  3. 3. Replacing dying especially in the epidermis where the requirement is continuous.Repairing the damage, mostly when the body has faced the onslaught of trauma and disease.
  4. 4.  Refers to all body  Contain diploid (2n) cell except the sex number of cell. chromosomes . Skin cell, muscle  somatic cells contain 46 cell, nerve cell, chromosomes or 23 bone cell, stomach homologous pairs of cell and liver cell. chromosomes. Multicellular organisms use mitosis for growth, cell repair, and cell replacement.
  5. 5. •Purpose ofmitosis isreplication ofsomatic cells andasexualreproduction•Mitosis is thedivision ofchromosomes ina cell•Usually followedby cytokinesis orcell division
  6. 6. •Refers to the  egg cell  Sperm cellgametes, thesperm cell ofmale and egg cellof the female
  7. 7.  Sex cells only contain 23 chromosomes and are called haploid. These cells have half the amount that a normal non-sex cell would have. So when they divide only 23 chromosomes are given to the new cell.
  8. 8. After these sex cellscombine andfertilization occursthe resulting cellthat is formed iscalled a zygoteAs soon as thezygote is formed, itthen begins to gothrough celldivision.
  9. 9. During Meiosis gamete (sex) cells undergo a “doubledivision”, maintaining the DNA, but reducing thechromosomal count to 23Sperm (23) + Egg (23) = Fertilized Cell(46)
  10. 10.  Autosomes Contain genetic information for most human characteristics, such as eye color, hair color, height, and skin pigmentationSex Chromosomes Primarily determines whether an individual is female (2 X chromosomes) or a male (1 X and 1 Y chromosomes)
  11. 11.  Somatic cell  Sex cell Is any cell that is  Refers to gametes non reproductive the egg cell and cell. sperm cell Contain 46  Contain 23 (n) of chromosomes or chromosomes 23 homologues  Undergo mitosis pair of and meiosis chromosomes Undergo mitosis
  12. 12. 1. Mitosis produces 2 daughter cells that aregenetically identical to the parent cell.Meiosis produces 4 daughter cells that aregenetically different from the parent cell.2. Mitosis produces diploid (2n) daughtercells. Meiosis produces haploid (n) daughtercells.3. In meiosis, a process called crossing overoccurs, whereby genetic material isexchanged b/w homologous chromosomes.

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