1. What is Mitosis:
Ans. Division of the nucleus of an eukaryotic cell into two daughter cells consisting same number of chromosomes involving condensation of the DNA into visible chromosomes.
The segregation of chromosomes or karyokinesis in mitosis is brought about by a complex machinery, the mitotic spindle, which is used to both push and pull: pushing drive the poles of the spindle apart while pulling draws the chromosomes towards the pole. This is why mitosis is regarded as a mechanical event in cell-cycle.
2. Why mitosis is called as Equational Division?
Ans. Mitosis is known as Equational Division, because:
a. The daughter cells receive same number of chromosomes as the mother cell.
b. Structure, appearance and attributes of the chromosomes remain unchanged.
c. The genetic attributed of the daughter chromosomes remains same as the parental ones.
3. What is Karyokinesis and Cytokinesis?
Ans. These are two phases of cell division, such as :
1. Karyokinesis: The process through which the parental nucleus equationally (Mitosis) for Reduceably (Meiosis) divided to give rise daughter nuclei.
2. Cytokinesis: The process by which the cytoplasm becomes divided through the middle of the two daughter nuclei.
4. What are the process of Mitosis?
Ans. The stages of mitotic divisions are:
Consisting of four phases:
i) Prophase: Condensation and coiling of chromosomes, spindle formation.
ii) Metaphase: Arrangement of the chromatids to opposite poles.
iii) Anaphase: Movement of chromatids to opposite poles.
iv) Telophase: Reintegration of the nucleus.
Division of the cytoplasm into two halves each with a daughter nucleus.