Question

Chromosomal condition of Down's syndrome is?

• A. Allosomal hypoaneuploidy
• B. Autosoimal aneuploidy
• C. Allosomal hyperaneuploidy
• D. Partial autosomal deletion

Answer 1

The correct option is B Autosoimal aneuploidy

Down syndrome is usually caused by an error in cell division called “nondisjunction.” Nondisjunction results in an embryo with three copies of chromosome 21 (autosomal chromosome) instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.

So, the correct answer is 'Autosomal aneuploidy'.