What Is the Second Most Commonly Recognized Genetic Cause of Mental

question 27

Multiple Choice

What is the second most commonly recognized genetic cause of mental retardation?

• A) Down syndrome
• B) Fragile X syndrome
• C) Klinefelter syndrome
• D) Turner syndrome

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Definitions:

Cerebral Hemisphere

One of the two parts of the brain, divided by the longitudinal fissure, that are responsible for different functions.

Cortex

The outer layer of the cerebrum in the brain, involved in various high-level brain functions such as thought, memory, and consciousness.

Lobes

Divisions of the brain or other organs marked by natural boundaries, such as the frontal, parietal, temporal, and occipital lobes of the brain.

Myelin Sheath

A fatty layer that surrounds nerve fibers, providing insulation and increasing the speed at which electrical impulses propagate along the nerve cells.