AP BIOLOGY

Detailed explanation-1: -Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby. Even though people with Down syndrome might act and look similar, each person has different abilities.

Detailed explanation-2: -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-3: -Trisomies, such as trisomy 21 (Down syndrome), are characterized by a triple chromosome. The most common symptom of the trisomies is intellectual disability. Chromosomes are found in the nucleus of all body cells. They carry the genetic characteristics of each individual.

Detailed explanation-4: -(TRY-soh-mee) The presence of an extra chromosome in some or all of the body’s cells. This results in a total of three copies of that chromosome instead of the normal two copies. For example, Down syndrome (trisomy 21) is caused by having three copies of chromosome 21 instead of the usual two copies.

Detailed explanation-5: -Trisomy 21 is the most common chromosomal anomaly in humans, affecting about 5, 000 babies born each year and more than 350, 000 people in the United States. Also known as Down syndrome, trisomy 21 is a genetic condition caused by an extra chromosome.