Question

Trisomy of 23^rd chromosome in male results in

• A. Turner syndrome
• B. Down syndrome
• C. Edward syndrome
• D. Klinefelter syndrome

Hint:

Important chromosomal disorders: \[ \boxed{ \begin{aligned} &\text{Down syndrome} &&\rightarrow \text{Trisomy 21} &\text{Edward syndrome} &&\rightarrow \text{Trisomy 18} &\text{Turner syndrome} &&\rightarrow 45,X &\text{Klinefelter syndrome} &&\rightarrow 47,XXY \end{aligned} } \]

Answer 1

The Correct Option is D

Step 1: Recall chromosomal disorders. A male with an extra X chromosome has the karyotype \[ \boxed{47,\;XXY} \] This condition is known as \[ \boxed{\text{Klinefelter syndrome}.} \]

Step 2: Eliminate the remaining options. \[ \begin{aligned} \text{Turner syndrome} &\rightarrow 45,X \text{Down syndrome} &\rightarrow \text{Trisomy 21} \text{Edward syndrome} &\rightarrow \text{Trisomy 18} \end{aligned} \]

Step 3: Choose the correct option. Hence, \[ \boxed{(D)} \] is the correct answer.