Human Genetic Disorders: Those disorders that are caused due to genes, their mutations and are transmitted from parent to offspring are called Genetic disorders. These disorders can occur in following ways- Numerical Changes in Chromosomes: Down’s Syndrome (Mongolism, Mongolian Idiocy)- The syndrome was discovered by Langdon Down in 1866. Its cause was found out by J. Lejeune in 1959. It is an aneuploid trisomic condition having 47 chromosomes i.e. the male has 45 + XY and the female has 45 + XX. This condition arises due to the nondisjunction of the 21st pair of chromosome so that both the chromosomes … Continue reading Human Genetic Disorders