(a) Describe the main stages of mitotic division. (b) State four ways in which mitosis is important to living organisms.
Explanation
(a) Main stages of mitotic division:Prophase -
Chromosomes appear as two threads/chromatids chromatids are long thin and/later become shorter and thicker; and joined together at the centromere; the nuclear memberane; and the nucleolus disappear spindle fibres form in the cytoplasm; with a pair of centrioles; one at each pole.
Metaphase:
spindle formation is completed the chromosomes are arranged at the equator of the spindle attached by their centromeres; centromeres divide; and begin to move apart. Anaphase The paired chromatids are pulled apart/separated migrate/move towards opposite poles spindle fibres shorten; chromatids reach the poles.
Telophase -
Fibres disappear, nuclear materials and nucleolus are formed bounded by nuclear membrane the cell constricts to form two daughter cells.
(b) Importance of mitosis:
Promotes cell growth replacement/repair of damaged tissues basis of asexual/ vegetative reproduction produces genetically identical offspring which are identical to the parents maintains the diploid number of the chromosome of the cell.