Question

Identify the incorrect pair.

• A. Klinefelter’s syndrome – 47, XXY
• B. Turner’s syndrome – 45, XY
• C. Down syndrome – 47 (+21st chromosome)
• D. Edward syndrome – 47 (+18th chromosome)

Hint:

When studying genetic syndromes, it is crucial to remember the specific chromosomal abnormalities associated with each syndrome to avoid diagnostic errors.

Answer 1

The Correct Option is B

Evaluating each genetic condition. Klinefelter's syndrome is correctly described as 47, XXY, involving an extra X chromosome in males. 
Turner's syndrome should be 45, X, not 45, XY. This syndrome is characterized by the presence of a single X chromosome and the absence of the second sex chromosome, not an XY configuration. 
Down syndrome is accurately described as having an extra 21st chromosome, leading to a total of 47 chromosomes. 
Edward syndrome is also correctly identified with an extra 18th chromosome, resulting in 47 chromosomes.