Svt - Cours - La Division Cellulaire (La Mitose)

We are going to see cell division more precisely what is called mitosis recall of 4th at the origin of any individual. There is a single cell, the cell of seven cells divide into two identical cells to form, the embryo a2 saloon. Then after multiple divisions, we will obtain an individual, but it sometimes happens that these two cells separate and divide each on their side.

In this case, they will each on their side form, a new individual. But this individual comes from two cells, which are identical by.Therefore, these two individuals are identical, they are identical twins. So the question that arises is, how does the division of the cells take place? So that we keep the same content of nuclei in each of these cells? We retain the cells of the organism except the reproductive cells, have the same genetic information as the up cell from which they come by successive divisions skives.

The student a graph showing the evolution the amount of DNA in the nucleus of a cell during a division. To draw our curve, we start by tracing the axes and indicated to everyone's taste the size of the unit Indra from another ex. And we draw the curve. Then, when we observe this curve, we see that we pass at a given moment by three units of quantity of DNA 6, which means that this quantity DNA has doubled. This is what 'we call DNA duplication. We also see that we go from 2 6 to 3, which means here that we have divided our quantity of ADR.

If we think about the level of the fauna of our chromosomes, we know. Two simple formulas and double chromosomes. So when we are a quantity of 3 g, logically our chromosomes is at a single chromatic of which to make a simple chromosome. When we duplicate, we have enough, simple chromosomes to double chromosomes.

And when we divide we go from CRO, on, Doug, simple chromosomes. We remember the division of a cell is prepared by copying each of its 46 chromosomes. This is called duplication, which allows you to go from a single chromosome to a chromatin a chromosome. All there. Two chromatic, we are going to see the behavior of the chromosomes during cell division.

If we observe under the microscope, the nuclei of cells during division, we observe the chromosomes visible, of course, but we can see that they are organized differently in the cell let's see a movie showing cell division in a cell. The first stage of cell division is called to profess, the chromosomes, DNA duplicates. And this little fall in place, two single chromosomes to double chromosomes and its. Chromosomes are going to be visible. They will come to align themselves with the equator of the cell.

This is called the meta files. Then the chromatic ones, detach and move towards the water pulse. Elena phase. Then the membrane is reconstituted, divides the cytoplasm. It is the tell phase. We go from a cell to 2 CV when a cell is at rest, the DNA, which constitute its chromosomes and in the unrolled form, which means that these promotions are not visible in the nucleus of this cell.

Moreover, these are. Simple chromosomes, they are made up of a single chromatin during the first stage of cell division the DNA which constitute the chromosomes is duplicated, which means that the emphasis the single chromosome to double chromosomes, then the dm curls up and without a role, which makes visible and the chromosomes in the cell. This first stage, which is called to profess is followed by a second stage, the meta files at the time of the meta phase.

The chromosomes are aligned at the level of the equator of. The cell then it is the phase at the level of the centers at the mayor, the two chromatic of each chromosome are detached. We pass from chrome, some, Joomla, simple chromosomes.

And the chromatic ones are moved towards the poles of the season when its simple chromosomes arrive at the level of the poles. It is there telefax once separated at the level of the two hens, the DNA, which constitute the chromosomes, this deposit, autumn and simultaneously. The cell builds limbs, India, a level of the equator, which. Divides the cytoplasm, we obtain 6 2 cells identical to the initial cell, but has the same nucleus with the same chromosomes, same genes.

And we retain the joint possession of a cell is characterized by the separation of the double chromosomes obtained following duplication, each of the two cells formed receives 23 pairs of single chromosomes, identical to those of the initial series in the form of diagrams. A cell is observed with its nucleus in this nucleus. There are chromosomes, which are simple, the. First stage of cell division will consist in passing from simple chromosomes to double chromosomes by the girlfriend of each of their chromatin. This is called duplication. Then we talked chromatin. We are going to go from double chromosomes to single chromosomes.

And we divide the site at the places we obtain two identical cells and its initials, which therefore has the same genes and the same Allen.

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