Chromosomes are present in the nucleus of the cell. Chromosomes are can only be seen when cells are dividing. In nature cell, each chromosome consists of two very thin threads called chromatids. They share common point of attachment called centromere, a disc shaped protein struture called Kinetochore is present to which spindle fibres attach during cell division. Centromere has functional relation to movement of chromosome. Chromosome is of thin threads called chromonema, at the beginning of leptotene, a sub stage of meisois. In many species chromonemata exhibit deeper staining region along their lengths giving the threads the appearance of strings of beads, these intensity staining areas are chromomers.
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