Mitosis cell division

12TH PHYSICS

Kinds of cell division
There are two kinds of cell division mitosis cell division and meiotic cell division mitotic is it for growth and replacement of older cells by new cells two daughter cells are identical and similar similar to mother sale in all respects mitotic cell division occurs in haploid and diploid cells
Miotic cell division occurs in the corners for sexual reproduction to produce gamets the resultant cells egg in female and sperms in male process half the chromosome number of that present in the parent cell cell division takes place only in diploid cells responsible for production of haploid sports or game it’s
Mitosis
Mitosis is divided into four pages or stage is termed as Pro page meta page and page page
These phases refer to the changes taking place in the nucleus the nucleus divides first and then the whole cell divides division of one nucleus to produce two daughter nuclei is called karyokinesis division of cytoplasm to give two daughter cells is called cytokinesis
Properties it shows 3 subpages
Early prophage
Centriole divides and each of the two centrioles start moving towards opposite poles of the nucleus of the dividing cell chromosomes appear As Long thread and start quilling nucleus energies and becomes less distant 

Medal prophage
Chromosome condensation is complete and they become salt and thick each chromosome is made up of 2, held together at their centromeres
Chromatid contains newly replicated total DNA molecule
Late prophage
Centrioles reach the opposite poles of the dividing cell some spindle fibres extend from pole to the equator of the dividing cell nuclear membrane disappears nucleolus is not visible
Metaphase
Chromosomes are brought towards the equator of the cell with the help of spindle fibres each chromosome becomes attached to the spindle fibres by centromere whereas each centromere is joined to the opposite poles the sister chromatids are not yet separated because the centromere has not provided
Anaphase
Centromeres of all the chromosome divide then each chromatid becomes a chromosome spindle fibres contract and pull the centromeres to the opposite poles is the chromosomes are pulled by spindle fibres to opposite poles by their centromeres they acquire Warriors shapes such as VJ or depending upon the position of centromere half the number of chromosomes move towards one pole and the other half to the opposite pole cytokinesis begins as the cleavage furrow starts from the Periphery towards the centre in animal cells and in plants cell plate appears in the centre that grows centrifugally towards periferi
Taylor page chromosomes uncoiled 24 a chromatin network as in the parent nucleus new nuclear membrane is formed around each daughter nucleus and nucleolus reappears again in each newly formed daughter nucleus
Cytokinesis
It is the process of the division of cytoplasm of a dividing cell into two it is initiated in the beginning of page and is completed by the end of t Lopez the mechanism of cytokinesis is different in plant and animal cells in an animal cell invagination of plasma membrane proceeds from the Periphery of the cell towards the interior and plant cell phragmoplast cell plate begins to form in the centre of cell and then expands toward the Periphery
Significance of Mitosis
It is an equational division and tatoo newly formed daughter cells are identical in all respects they receive the same number and kind of chromosomes Asma in the mother cells it is the only mode of reproduction in unicellular organisms it is the process by which growth takes place in multicellular animals and plants by constantly adding more and more cells also plays a role in repair during growth for example in sound healing regeneration of damaged part as in the tale of lizard and replacement of cells lost during normal wear and Tear as the US officials of the skin of the red blood cells
Mitotic cell division Limited aur unlimited
Growth by mitosis occurs in a limited or controlled manner to the extent it is required in the body but at times due to some special cases the number of cells may increase abnormally which may cause cancer
In plant tissue culture a cell from a plant can be grown in a nutrient medium where it divides buy my tortoise to give n undifferentiated cells Mars called kelas capable of differentiating into a plant in the presence of nutrients and specific growth hormones in animals stem cell culture is also based on the ability of a cell to divide and give rise to sales of specific type

Leave a Reply

Your email address will not be published. Required fields are marked *