10th Group A students- Discussion forum for the lesson Cell division

crop improvement and biotechnology

crop improvement and biotechnology

by bagtec2018512 N.M. Sudusingha -
Number of replies: 0

Cell division - cell division is the process by which a parent cell decides in two or more daughter cell.

Cell Cycle and Cell Division | eMedicalPrep

Importance of cell division for a living cell -

  • In unicellular organism cell division reproduce an entire organism.e.g amoeba
  • cell division can produce the progeny from some multi cellular organism such as plants which grow from cutting.
  • cell division also enables sexually reproducing organism to develop from a single cell,the fertilized egg or zygote.
  • cell division involves in repairing of cells.e.g bone marrow makes the new blood cell.
  • it is important because it distributes the identical genetically material to daughter cell.
  • with the cell division growth occur through and increase in volume and enlargement of the outer membrane.
  • without cell division death will quickly ensure.
  • Genetic variation - 
  • Meiosis provides a part to remain the chromosomal number constant generation.
  • In asexually reproduced organisms the variation among off spring occurs through mutation.
  • genetic variation occurs through meiosis.
  • It can produce off springs very quickly.e.g prokaryotes
  • mutation is also present in sexually reproduced cell.
  • Methods of genetic variation in meiosis -
  • crossing over
  • independent assortment of homologous chromosome 
  • crossing over
  • exchange of genetic material between non-sister chromosomes of a bivalent during meiosis. 
  • average of two or three cross over in per human chromosome takes place.
  • it is necessary for normal segregation e.g reduced levels of crossing over have occurred due to the extra copy of chromosome 21. 

 




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