OOGENESIS PROCESS
The process of ooginesis
is the stage where the female ovum has grown and progressed from germ cells to
germ cells. A perfect ovary will have cell cells that are almost similar to
promordial cells in the testes. This promordial cell cell will produce an egg.
There are several stages
experienced by the process in this ooginesis process from mutification to
maturation process (perfect).
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| Crocodile and us is examples of animals that oogenesis |
1. multiplication phase
In the mitotic stages of
this cell cell is divided into several sapling cells on the end result
(promordial germ cells). Oogonium will divide this cell cell into several times
by the process of mitosis so that the end result will be a large cell and better
known as primary oocyte.
The oocyte cells of this
promer will not undergo division or growth anymore. At a later stage he will
experience some growth.
2 stages of growth
This phase or stage is a
complicated and difficult stage of sperm formation (spermatoginesis). Before
entering the growth stage the size of the primary ooginesite cell is about 50
microns and after entering and the stage of the growth stage will increase its
diameter diameter to 2,000 microns.
In the growth process
will occur the addition of foods such as fat, carbohydrates and proteins so
that in addition to yellowish color also increased in diameter size. If we
observe the example of this process in real life, ie on eggs, either chicken
eggs or other. There will be a yellow color of the egg that is more conding
lying down towards the egg. And above it will be filled by egg whites which
contain protein and cytoplasm. It should be known even though it appears to
coalesce eggs with cell nuclei, cached so it is with the term animal pole.
In the cytoplasm it is
structured like a plain cytoplasm as it encounters DNA, ENZIM, RNA. And other
material, besides matei there is also organel seoerti mitochondria that will be
used to menghasiilkan energy. Golgi and ribosome bodies in large numbers. Which
will be used by the cell. There are some animals that have different location
where mitochondria, amperti amperti, mitochondria will accumulate in certain
parts so it will look like a lump. There are also some genes present in nukelus
that require activities to synthesize RNA to increase the number, so it will be
known as redundancy.
As the size of the cell
increases, the nucleus will also increase in diameter, this increases the
amount of nukeoplasma that increases due to increased synthesis of ribosomal activity.
At this stage in some of the chromosomal amphibians change shape and become a
giant lampbrush chromosome.
3 Phase of maturation
The maturation phase is
the last process of the ooginesis stage, the maturation phase of the oocyte
cell will undergo division again (reduction division / meosis). In this phase
the oocyte cell will divide by meosis and the result of his forehead into an
ovum (egg). There are several differences from cleavage of speratogenesis and
primary oocyte. One is the end result, the end result of the primary oocyte
produces a large haploid cell, and spermatogenesis will have 4 sperm cells. The
three remaining cells of the oocyte will form three small polar bodies. In the
formation of egg cells we can see the unequal distribution of the results will
be in the food needs, the food will be much stored and used for developing
embryo.
At the beginning of the
maturation stage (meosis 1) will occur chromosim translation to half. The
homologous chromosomes will be cross-linked with other chromosomes. The fused
membrane will break so that the chromosomes of the chromosomes will move and
head toward the opposite pole, then will be followed by a split cytoplasm.
The final stage of the
maturation phase is cytokinesis. This process will form a large secondary
oocyte (ootid) coupled with a small polar body. During final maturation
(meiosis II) secondary oocytes haploid also polar body undergoes mitotic
division.
The polar body will be
divided into two, and a secondary oocyte will form a mature egg and a second
polar body. Thus the final result of the second maturation is the formation of
large eggs and three polar bodies. The polar body will rupture and degenerate
in order for the egg to be used for fertilization.
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