A common cause of intellectual disability is an extra copy of chromosome 21,a condition known as:
A)Williams syndrome.
B)Down syndrome.
C)autism spectrum disorder.
D)genetic aphasia.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21. This extra genetic material can lead to characteristic physical features, developmental delays, and intellectual disability. Williams syndrome is caused by a deletion of genetic material on chromosome 7 and is characterized by specific facial features, cardiovascular issues, and intellectual disability. Autism spectrum disorder is a neurodevelopmental disorder with a complex genetic and environmental etiology that is not directly caused by an extra copy of a chromosome. Genetic aphasia is a rare genetic disorder affecting language development and is not directly related to intellectual disability caused by an extra chromosome.

A Common Cause of Intellectual Disability Is an Extra Copy