Question

Identify the characteristics that belong to Down's syndrome.

• A. Trisomy of 21st chromosome.
• B. Monosomy of X chromosome.
• C. Presence of 46+1 chromosomes.
• D. Presence of 44+XXY chromosomes.

Answer 1

Answer: (A), (C)

The correct options are
A Trisomy of 21st chromosome.
C Presence of 46+1 chromosomes.

Down syndrome is a chromosomal disorder which arises due to the trisomy of 21st chromosome. It is characterised by the presence of 46+1 chromosomes in the body. Monosomy of X chromosome is a condition that occurs in Turner's syndrome, while presence of 44+XXY chromosome is a feature of Klinefelter's syndrome.