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- #National Eligibility Cum Entrance Test
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- #Cell Structure and Function
- #National Eligilibility Cum Entrance Test
Mitosis is called the equational division because
Option: 1
The number of chromosomes is reduced in parent cell
Option: 2
The number of chromosomes is reduced in daughter cell
Option: 3
The number of chromosomes in the parent cell and daughter cells is equal
Option: 4
The number of chromosomes is reduced in both the parent cell and daughter cell
Answers (1)
Mitosis -
Mitosis
- Mitosis is also called the equational division (because the daughter cells have an equal number of chromosomes as that of parents) and somatic cell division (because it occurs in somatic cells).
- Mitosis was first observed by Strasburger in 1875.
- The term mitosis was given by Fleming in 1882.
- The following two theories have been proposed to substantiate the occurrence of the mitosis:
a) Kern plasm theory: It was proposed by Hertwig.
- According to this theory mitosis occurs due to disturbance in Karyoplasmic Index.
- Karyoplasmic Index of small cell is high as they have less cytoplasm. Nucleus efficiently controls the activity of cytoplasm in small cells.
- In a large cell nucleus fail to control the activity of cytoplasm.
- To attain the control of nucleus on metabolism a large cell divides into two cells.
b) Surface-volume Ratio:
- When a cell grows in size its volume increases more than its surface.
- So a stage will reach when the surface area becomes insufficient to draw the material.
- At such a critical stage, division of cell started.
-
Mitosis is a type of cell division. It is also called the equational division (because the daughter cells have an equal number of chromosomes as that of parents.
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