Question

need to know answers to A and B.

A. outline the stages if mitosis(nuclear division)

B. what is the function of mitosis?

Answer 1

A. The stages of mitosis are prophase, metaphase,anaphase and telophase.

Prophase is the stage where the mitosis begins. In prophase the nucleus and nucleolus begins to disappear and we can see the starting of the bipolar spindle fibre formation. The chromatin becomes condensed.

Metaphase is the phase which comes second. In metaphase the condensed chromatin fibres makes chromosome with 2 chromatids which gets allignex in the metaphase plate. The spindle poles now reach the 2 poles of the cell and the spindle fibres that forms from there gets extended and these microtubules gets attached to the kinetochore of the centrosome of each chromatids.

Anaphase is the next phase where the chromatids gets seperated. Here the chromosome with 2 chromatids gets seperated and each chromatids are pulled to each poles by the spindle fibres.

Telophase end with the nuclear division. Now the chromatids have reached each poles and nuclear envelope starts to reform around the chromatids. The nucleolus too appears to reappear.

Cytokines. Now the nuclear division is finished. Now we can see two nucleus at each poles of the cell. A cleavage furrow is formed in the centre of the cells which extend more to the centres and thus makes the cell separated in two with each new cell having individual nucleus.

B. Mitosis is the process by which each cells seperate into two daughter cells which are having the same nuclear number as that of the parent. Thus mitosis helps in cell division. So the function of mitosis is to divide the cell and to help in the growth and to replace the damaged cells.