phase of mitotic division
a. Definition
There are several
stages or phases that will be passed by a cell in the breed. The common
division of cells is the division of mitosis.
When viewed from the
characteristic division of mitosis is the division that produces the cell
nucleus into two new tillers (two new cell nuclei). One cell can produce two
new daughter cells and have identical properties. The chromosome from the
parent will be the same as the new tiller cell.
The unique fact is the
determination of DNA inheritance from generation to generation.
Extraordinary!!! There is one phase that the period of time is so short and
alternating with other long division phases of this stage is called the
interphase stage.
When we discuss in general, the stage of mitosis is divided
into 5 parts, namely prophase, prometafse, metaphase, anaphase, and telofase.
Mitotic division is usually followed by the process of cytokinesis, which is a
division followed by cytoplasmic division. The process of mitotic cleavage
serves to retain genetic factors from one generation to the next.
Actually the first
stage starts with profase, but I will escort it with interfase. Due to this
stage is the transition from the next stage stage.
1. Interphase: there
are 3 periods passed by this stage of early growth, DNA and second growth. The
hallmark of this growth is the creation of a pair of centrosomes from a single
centrosomal replication.
2. Profase: chromatin
yarn yarn will be docked so as to form a chromosome. This can be seen with a
light microscope. Furthermore nukelus with nuleolus will vanish. The
chromosomes will be duplicated to form a pair of chromatids connected to the
centromere. Sentriol will move toward the poles and accompanied by a spindle
mitotik (elongation formed from mikrotubul). The microtubule pushes the
centrosome to move toward the poles.
3. Prometafase: This
phase is an advanced phase of prophase where the cell nucleus is still in the
process of elimination and begins to fragment. Here there will be microtubule
connectors and non microtubule connectors that have various functions.
4. Metaphase: the
longest stage of mitosis is this stage, lasting about 20 minutes or more. The
yarn of chromatin (spindle) yarn is very clearly visible. The yarn thread is
tied to a centrosome that is already at the pole position that is across. The
chromosomes are in the middle or aerial plane. The number of chromosomes in a
cell already has 4n chromosomes.
5. Anafase: contrary to
the previous stage this phase lasts only a few minutes and is very fast. The
binding chromosome had begun to divide suddenly and into two equal parts toward
the opposite pole. You could say 2n chromosomes towards the north kutup and 2n
other chromosomes in the opposite direction. In line with the separation of
these chromosomes menghbabkan elongated cell structure. Until the end of this
stage each end of the cell has the same and complete number of chromosomes.
6. Telophase: the
position of the chromosome is fitted to the respective poles so that nucleolus
(core child) begins to be seen again. Chromatids begin to disappear so that the
cytoplasm begins to thicken and the cell membranes begin to separate the two
children of the cell. The final stage of this mitosis is that one nukelus
produces two nuclei and has identical similarities. On the cytoplasmic
thickening will take place cytokinesis process.
7. Cytokinesis: in the
cytoplasmic thickening process and separation of the two cells, its prolonged
bore occurs in the late stages of telofase. In animal cells, the cell structure
is curved and appears to divide the two new sapling cells.
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