NEET BIOLOGY

Detailed explanation-1: -About 95 percent of the time, Down syndrome is caused by trisomy 21-the person has three copies of chromosome 21, instead of the usual two copies, in all cells.

Detailed explanation-2: -Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy. ‘ Down syndrome is also referred to as Trisomy 21.

Detailed explanation-3: -Down syndrome is a condition or a syndrome, not a disease. People “have” Down syndrome, they do not “suffer from” it and are not “afflicted by” it. “Typically developing” or “typical” is preferred over “normal.”

Detailed explanation-4: -It is a genetic condition resulting when a baby is born with three rather than the typical two copies of chromosome 21. Down syndrome is referred to as ‘Trisomy 21 as there are three copies of chromosome 21.

Detailed explanation-5: -Down syndrome Definition – It is a genetic disorder, which leads to various physical and mental disabilities. It is due to the presence of an extra chromosome 21 also known as trisomy of chromosome 21. Down syndrome is one of the leading causes of genetic disorders around the world.