ICSE Class 10 Answered

A protein complex called cohesion has a stabilising effect on the structure of DNA. This protein controls how tightly cohesin binds to DNA. The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes. During cell division, the chromosome undergoes dehydration, spiralisation and condensation. So they become progressively thicker and smaller and, accordingly, the stability of chromosome also increases, thereby retaining its proper shape and structure.