A condition caused by the presence of an extra chromosome on the 21ˢᵗ pair and characterized by intellectual developmental disorder and various physical anomalies is ______.
A) Down syndrome
B) Klinefelter's syndrome
C) fragile X syndrome
D) Turner's syndrome

Question

Quizplus · Accepted Answer

Down syndrome is caused by the presence of an extra chromosome on the 21st pair, resulting in intellectual developmental disorder and various physical anomalies such as a small stature, low muscle tone, and characteristic facial features. Klinefelter's syndrome is caused by an extra X chromosome in males, resulting in infertility and other physical and developmental issues. Fragile X syndrome is caused by a mutation in the FMR1 gene, resulting in intellectual disability and behavioral and physical issues. Turner's syndrome is caused by a missing or partially missing X chromosome in females, resulting in various physical and developmental issues.

A Condition Caused by the Presence of an Extra Chromosome