Complete Explanation Of Mitosis Phases In Urdu Hindi | Class 12 Biology
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- เผยแพร่เมื่อ 5 ก.พ. 2025
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About This Video ........................
In This Video Lecture You Will Learn Basic Concept Of Mitosis
It is the type of cell division, which ensures the same number of chromosomes in the
our statement will base on the animal cell. It can take place in haploid as well as in
diploid cells in nearly all parts of the body if and when required.
daughter cells as that in the parent cells. In spite of slight diferences, major steps of
Mitosis is a continuous process, but conventionally it may be divided into two
mitosis are similar in plants as well as in animals. However, to avoid the confusion
phases, i.e., karyokinesis, which involves the division of nucleus and cytokinesis that
refers to the division of the whole cell
Prophase
During interphase (non-dividing phase) of the cell cycle the chromosomes are not
visible even with electron microscope, but using histologic stains for DNA, a network
of very ine threads can be visualized. This network is called as chromatin.
Metaphase
chromatin. Mitotic apparatus disorganizes nuclear membrane and nucleoli reorganize,
Cytokinesis
more viscous.
sister chromatids are separated from centromere. As a result, half sister chromatids
by cleavage furrow, which deepens towards the center of the cell, dividing the parent
special proteins where kinetochore ibers of mitotic apparatus attach.
having two sister chromatids, attached at centromere. Towards the end of prophase,
sister chromatids, attached at a point called centromere or primary constriction. The
disappear. Mitotic apparatus is organized (as described above). Cytoplasm becomes
telophase. The chromosomes decondense due to unfolding, ultimately disappear as
Telophase
in centromere) of chromosome, and align them at the equator of the spindle forming
centromere has special area, the kinetochore, with speciic base arrangement and
The chromatin material gets condensed by folding and the chromosomes appear as
nuclear envelope disappears and nuclear material is released in the cytoplasm, nucleoli
chromatids in the daughter cells. The kinetochore ibers of spindle contract towards
Reaching of the chromosomes at opposite poles terminates anaphase and start
The kinetochore ibers of spindle attach to the kinetochore region (specialized area
Each metaphase chromosome is a duplicated structure which consists of two
resulting two nuclei at two poles of the cell.
equatorial plate or metaphase plate. Each kinetochore gets two ibers one from each
During late telophase the astral microtubules send signals to the equatorial region
of the cell, where actin and myosin are activated which form contractile ring, followed
thin threads (0.25mm - 50mm in length) at the beginning of prophase.
pole.
Chromosomes become more and more thick ultimately each chromosome is visible
Anaphase
their respective poles, at the same time polar microtubules elongates exert force and
travel towards each pole.
It is the most critical phase of the mitosis, which ensures equal distribution of
cell into two daughter cells.
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