Question

Explain the structure of chromosomes in short

Answer 1

chromosome is a rod like or thread like structure that are formed by condensation of chromatin fibres during cell division of chromosome consists of two similar trade called chromatics the two chromatids are attached to one another at a point called centromere the two parts on either side of a centre near are known as arms.
the number of chromosomes is fixed in an organism in most organism chromosome occurs in homologous pairs in each pair one chromosome comes from father and other belongs to mother parents the presence of two sets of chromosome is called diploid or 2n

Answer 2

$\boxed\large\underline\bold{Structure~of~Chromosomes}$

Every chromosome in the condensed form during the beginning of cell division, consists of teri chromatids joined at some point along the length. This point of attachment is known as centromere. It is visible as a small constricted region. The centromere also serves the purpose of attaching to the spindle fibre when the cell division takes place. The place of centromere in every chromosome is fix i.e at a particular place. As the spindle fibre contracts, the sister chromatids are separated at the centromere, and each is pulled in opposite directions towards the respective poles of dividing cells. After the completion of cell division, the chromatids which have now become chromosomes, decondense and revert to their long and fine somewhat thread-like chromatin fibres.