Answer:
(a) If nuclear membrane
fails to disintegrate, the spindle fibres would not be able to reach
chromosomes and they would not move towards opposite poles of the cell. In
certain protozoans, such as Amoeba, the spindle is formed within the nucleus
and this is called intra nuclear mitosis or pre-mitosis.
(b) If DNA
duplication does not occur than cell might not be able to surposs S-phase of cell-cycle
as no chromosome formation will take place, and will not be able to enter M-(mitotic
phase) or if in case it enters mitosis the cycle will cease,
(c) If the
centromeres do. not divide one of the daughter cell will receive a complete
pair of chromosomes and other cell would not get any of them. This may result in
trisomy.
(d) If
cytokinesis does not occur, then multinucleate condition called coenocyte,
syncytium is produced, as in Rhizopus and Vaucheria, etc.
You need to login to perform this action.
You will be redirected in
3 sec