Each and every feature in any organism is controlled by one or the other gene located on the $DNA$ present in the chromosome.

$DNA$ is the carrier of genetic information.

it is hence transmitted from one generation to the other without any change or alteration.

– However changes or alteration do take place occasionally.

Such an alteration or change in the genetic material is referred to as mutation.

A number of disorders in human beings have been found to be associated with the inheritance of changed or altered genes or chromosomes.

These are disorders or illness caused by one or more abnormalities in autosomes or sex chromosomes of the person.

Thus, referred to as a autosomal disorders or sex-linked disorder respectively.

The genetic disorder can be divided as.