Question

Explain the process of mitosis

Answer 1

Mitosis is a cell division in which the parental cells divide to form new cells. It is the replication of cells to form copies of new cells. Mitosis is essential to replace the old cells which are deterioting .It's required for growth and development of all organisms.

Answer 2

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Mitosis occurs in two steps :-

1. KARYOKINESIS :- It is the division of nucleus.

It is divided into four steps :-

i) Prophase - It is the longest phase. In this chromatin fibres condense to form chromosomes. Centrioles reach the poles and form spindle fibres. Nucleolus and nuclear membrane disappears.

ii) Metaphase - Chromosomes are attached to spindle fibres that arises from each pole and lie at equator forming metaphasic plate.

iii) Anaphase - In this phase centromere of each chromosome divides to form two daughter chromosomes.

iv) Telophase - Nucleus and all other cell organelle lease reappear forming to daughter nuclei.

2. CYTOKINESIS :- it is referred to as the division of cytoplasm . In animals it occurs as cell furrow formation and plant it occurs by cell plate formation.

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