NEET BIOLOGY

Detailed explanation-1: -Most cases of Down syndrome result from trisomy 21, which means each cell in the body has three copies of chromosome 21 instead of the usual two copies.

Detailed explanation-2: -Trisomy 21, also known as Down syndrome, is a condition characterized by a distinctive pattern of minor and major anomalies associated with excess chromosome 21 material.

Detailed explanation-3: -Down syndrome (trisomy 21) is a genetic disorder caused by the presence of all or a portion of a third chromosome 21. Patients typically present with mild to moderate intellectual disability, growth retardation, and characteristic facial features.

Detailed explanation-4: -Common problems include crossed eyes, nearsightedness or farsightedness, and cataracts. Most eyesight problems can be made better with eyeglasses, surgery, or other treatments. Your child should see an eye doctor (pediatric ophthalmologist) before he or she turns 1 year old. Hearing loss.

Detailed explanation-5: -Also known as Down syndrome, trisomy 21 is a genetic condition caused by an extra chromosome. Most babies inherit 23 chromosomes from each parent, for a total of 46 chromosomes. Babies with Down syndrome however, end up with three chromosomes at position 21, instead of the usual pair.