Which genetic disorder is characterized by rocker-bottom feet?

Which genetic disorder is characterized by rocker-bottom feet?

• A. Down syndrome
• B. Trisomy 18
• C. Turner syndrome
• D. Fragile X syndrome

Answer: (B)

Rocker-bottom feet are a characteristic physical finding commonly associated with Trisomy 18, also known as Edwards syndrome. This genetic disorder is caused by the presence of an extra 18th chromosome and is marked by a range of severe developmental and physical abnormalities. The term "rocker-bottom" describes the shape of the feet, which appear to have a convex and rounded surface at the bottom, causing issues with balance and walking.

Trisomy 18 is characterized by various other clinical features as well, including severe intellectual disability, growth retardation, and multiple organ system anomalies. The presence of rocker-bottom feet is a critical element in the clinical diagnosis, among other signs.

In contrast, the other conditions listed, such as Down syndrome, Turner syndrome, and Fragile X syndrome, feature their own distinct clinical presentations and associated physical findings, but rocker-bottom feet are predominantly linked to Trisomy 18 specifically. Understanding these nuances is vital in genetics and the diagnosis of congenital disorders.