Which of the following is NOT a characteristic of Klinefelter syndrome?

Which of the following is NOT a characteristic of Klinefelter syndrome?

• A. XXY chromosome pattern
• B. Increased height
• C. Normal intelligence
• D. Rocker-bottom feet

Answer: (D)

Klinefelter syndrome is a chromosomal condition that results from the presence of an extra X chromosome in males, typically resulting in a XXY chromosome pattern. This genetic anomaly leads to several physical and cognitive traits.

The characteristics associated with Klinefelter syndrome include an XXY chromosome pattern, which is the hallmark of the syndrome. Additionally, individuals with this condition tend to have increased height due to the effects of the extra chromosome on growth. Many individuals with Klinefelter syndrome also possess normal intelligence, although they may experience challenges with language and processing skills.

Rocker-bottom feet, however, are a condition typically associated with other chromosomal abnormalities, such as Trisomy 18 (Edwards syndrome), rather than Klinefelter syndrome. This specific foot deformity is characterized by a convex shape and is not found in individuals with Klinefelter syndrome. Therefore, the presence of rocker-bottom feet serves as an indicator that the genetic and developmental issues rooted in Klinefelter syndrome do not include this characteristic.