Question

What is the most common autosomal abnormality seen among humans?

1) Down syndrome
2) Turner syndrome
3) Klinefelter syndrome
4) Cri du chat syndrome

Answer 1

The most common autosomal abnormality is Down syndrome, characterized by an extra copy of chromosome 21, leading to mental and physical impairments.

Step-by-step explanation:

The most common autosomal abnormality seen among humans is Down syndrome. This genetic disorder, also known as trisomy 21, occurs when a person has three copies of chromosome 21 instead of the typical two. Down syndrome is characterized by a combination of mental and physical impairments, including a specific facial appearance, and developmental challenges. Although there are other chromosomal disorders like Turner syndrome and Klinefelter syndrome, they are not autosomal as they involve the sex chromosomes. Most autosomal trisomies do not result in viable births, but Down syndrome is an exception where individuals can survive to adulthood, especially with proper assistance and care.