Write the four important features of the chromosome.

Explanation

The four important features of the chromosome are:
The shape of the chromosome is specific: The long, thin, lenghy structured chromosome contains a short, constricted region called centromere. A centromere may occur any where along the chromosome, but it is always in the same position on any given chromosome.
The number of chromosomes per species is fixed: For example the mouse has
40 chromosomes, the onion has 16 and humans have 46.
Chromosomes occur in pairs: The chromosomes of a cell occur in pairs, called homologous pairs. one of each pair come originally from each parent. example, human has 46 chromosomes, 23 coming originally from each parent in the process of sexual reproduction chromosomes are copied: Between nuclear divisions, whilst the chromosomes are uncoiled and cannot be seen, each chromosome is copied. the two identical structures formed are called chromatids.