The Core of the Cell-To-Be turning into Centrosome-to-be
The core of the Cell-to-be, it was once said, would later turn into Centrosome. But why is it then that today’s Centrosome is located at the edge?
Illustration 1 depicts the condition of an individual post-division or post-Cytokinesis Cell. Here an attempt is made to explain how the core got shifted out edge-wise.
In Illustrations 2 and 3 the centre of the Cell-to-be is seen to be in the middle, surrounded—either densely as in illustration 2 or only partially as in illustration 3a—by many DNAs-to-be. The core of the Cell-to-be and the DNAs-to-be inside the Cell-to-be are in many ways different. They are different not only in terms of the configurations of their molecules, their shapes, their volumes, but also in terms of their weights. No matter how small the difference in their weights is, this will still, in the course of their evolution, result in their taking different positions inside the body of the Cell-to-be. In the long run, what occurs is the separation of the DNAs-to-be from the core of the Cell-to-be so as to form groups of their own as shown in Illustration 3.
Should this seem to be less convincing, let’s do a little bit of experiment by envisaging that what is depicted in illustration 4a is a hollow glass ball inside which there are five blue beads tied to a black bead (A) supposedly to be bit heavier than the rest. All six beads are then submerged into some thick oil, the specific density of which is somewhere between that of the five blue beads and that of the black bead. It becomes evident here that for as long as the glass ball remains still, all six beads will stay still and adrift in the oil for quite a long time, providing that the difference in the specific densities of the blue beads, the black bead, and the oil is very slight.(illustration 4a). However, if the glass ball containing the thick oil and the six beads drifting in it is shaken with a few taps on its bottom, the black bead, being heavier, tends to go deeper down, separated from the other five beads, which tend to move upwards and gather, as shown in Illustration 4b.
This experiment is perhaps proof enough to justify the claim that the core of the Cell-to-be and the DNA-to-be too did experience the same thing such that later the core of the Cell-to-be had to move sideways, exactly at the spot where we have the Centrosome today.
Illustration 5 is a portrayal of events when the Cell-to-be was first formed. The body of the Cell-to-be is here shown to be under a circumstance where it is initially affected by natural forces, thus making it looks as though it were somewhere in the period extending from the Interphase to the Anaphase. The core or the centre of the Cell-to-be splits up, leading to the dismantling of the compounds, including the DNA-to-be. The DNA-to-be is positioned at the core of the Cell-to-be or the Centrosome-to-be wherefrom it elongates up to the surface of the Cell-to-be.
Illustration 6 shows the various events that take place during the division of the present day Cell. Shown in the illustration is the existence of the Centrosome at the time when the Cell has just undergone Cytokinesis or a period extending from the Interphase to the Anaphase. Unlike the way it was when the DNA-to-be first emerged and was still in unity with the Centrosome-to-be, here however the DNA has been totally separated from the Centrosome.
Even until today the Centrosome continues to secure its position at the edge, with the DNA totally separated from it.
Illustrations 5 and 6 are here meant to further convince the reader that at the beginning the Centrosome was actually the core of the Cell-to-be which, due to some common natural events, had been forced to shift sideways.
Given below are more illustrations of the evolutionary journey of the centre of the Cell-to-be whereby it transforms itself into a Centrosome.
That is why each time the cell divides, this division is always preceded by the division and multiplication of the Centrosome, the way the core of the cell-to-be did earlier. (See the black dot at the center of the circle in illustration 7a).