Chromatin is a tangled fibrous mass made up of DNA and protein. The chromatin material condenses to form chromosomes during cell division. Chromosomes are composed of DNA and protein. DNA molecules contain the information necessary for constructing and organising cells. Functional segments of DNA are called genes. A chromosome consists of two identical and spirally coiled threads called sister chromatids. They are joined at a constriction called centromere.
The following picture shows the chromatin, chromatid and chromosome in the cell.