which nuclear component changes into chromosome during clell division
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chromatin fibre or DNA
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The answer is DNA.
DNA is a long thread like structure approximately about 2meter long.
Therefore to accomodate itself in microscopic cell, that to in more smaller nucleus, it needs to be coiled.
Therefore, DNA coils around histone proteins and thus forms a beads in a string like structure when seen under electron microscope.
These coiled DNA along with histone and some non-histone proteins is known as chromatin.
Chromatin form remains during G1, S and G2 phases of cell-cycle.
But during cell division, more coiling of DNA is required so that equal distribution in daughter cells can be done without any problem.
Because, division in the form of long chromatin may lead to tangling and formation of knots.
Therefore, during prophase stage of cell division the chromatin fiber or coiled DNA starts supercoiling and at metaphase stage it is so much coiled that it appears as short,rod-like structures.
So, we can conclude that the nuclear component which changes into chromosomes during cell division is actually our DNA.
In short we can say, DNA, chromatin and chromosome are same thing but according to different dituation,different naming are there.
DNA is a long thread like structure approximately about 2meter long.
Therefore to accomodate itself in microscopic cell, that to in more smaller nucleus, it needs to be coiled.
Therefore, DNA coils around histone proteins and thus forms a beads in a string like structure when seen under electron microscope.
These coiled DNA along with histone and some non-histone proteins is known as chromatin.
Chromatin form remains during G1, S and G2 phases of cell-cycle.
But during cell division, more coiling of DNA is required so that equal distribution in daughter cells can be done without any problem.
Because, division in the form of long chromatin may lead to tangling and formation of knots.
Therefore, during prophase stage of cell division the chromatin fiber or coiled DNA starts supercoiling and at metaphase stage it is so much coiled that it appears as short,rod-like structures.
So, we can conclude that the nuclear component which changes into chromosomes during cell division is actually our DNA.
In short we can say, DNA, chromatin and chromosome are same thing but according to different dituation,different naming are there.
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