Question

The genotype XXY corresponds to

a. Klinefelter syndrome

b. Turner syndrome

c. Triplo-X

d. Jacob syndrome

Short answer

The correct option is (a).

Step-by-step solution

Step 1. Introduction  

A normal genotype is XX for female and XY for male. Genotypic abnormalities arise when an extra X or Y chromosome copy is formed or even if either X or Y chromosome is missing. This extra copy or missing chromosome can lead to several conditions in man or women.

Step 2. Explanation of Correct Option 

The genetic condition Klinefelter syndrome is a condition when a male is born with an extra copy of the X chromosome. XXY syndrome is another name for this condition.

Thus option (a) is correct choice.

Step 3. Explanation of Incorrect Options 

Turner syndrome is a chromosomal disorder in which a female is born with only one X chromosome. So its genotype is only X.

Thus option (b) is incorrect.

Triple X syndrome is an abnormality resulting in an extra X chromosome in some females. Thus its genotype is XXX.

So option (c) is incorrect.

In Jacobs syndrome, or 47, XYY syndrome, one extra copy of Y chromosome is present, so its genotype is XYY

So, option (d) is incorrect.