DNA QUESTIONS

1. The table below diagrammatically shows the stages of mitosis in eukaryotic cells
a Complete the table by filling in the missing stage labels and descriptions

___________

  • chromatin not visible
  • DNA, histones and centrioles all replicated

___________

  • _________________________________
  • centrioles at opposite poles of cell
  • nucleolus disappears
  • phase ends with the breakdown of the nuclear membrane

Metaphase

  • _________________________________

Anaphase

  • _________________________________
  • _________________________________

___________

  • spindle fibres disperse
  • nuclear membraness from
  • nucleoli form

___________

  • In animal cells a ring of actin filaments forms round the equator of the cell, and then tightens to form a cleavage furrow, which splits the cell in two.
(8)
b

Explain the importance of mitosis to living organisms.

 

 

 

(3)