PATHOLOGY

Detailed explanation-1: -Down’s syndrome is an example of aneuploidy which is due to the trisomy of chromosome 21.

Detailed explanation-2: -Trisomy is the most common aneuploidy. In trisomy, there is an extra chromosome. A common trisomy is Down syndrome (trisomy 21).

Detailed explanation-3: -Down’s syndrome-Trisomy of 21st chromosome. Edward’s syndrome-Trisomy of 18th chromosome. Patau syndrome-Trisomy of 13th chromosome. Klinefelter’s syndrome-There is an additional number of the X chromosome, XXY. Turner’s Syndrome-One X chromosome is less, XO.