In the nucleus of a dividing cell, the chromatin condenses so that each chromosome, now made of two sister chromatids, can be seen with a light microscope.
A Chromosome is a linear fragment of the genetic material contained in a eukaryotic cell, which is composed by two sister chromatids before mitotic cell division.
Chromosomes form part of the genome of the cells and they have a size suitable to see at 1000 X microscope magnification.
Each chromosome before cell division (either mitosis or meiosis) is composed of two sister chromatids that are linked at the centromere level in order to be correctly separated (segregated) during this process.
In conclusion, in the nucleus of a dividing cell, the chromatin condenses so that each chromosome, now made of two sister chromatids, can be seen with a light microscope.
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