A male has a defect in the X chromosome of the 23rd pair. As children, people with this syndrome experience symptoms that can range from mild to severe or even profound intellectual disability. This is known as ________.
A) fragile X syndrome
B) Down syndrome
C) fetal alcohol syndrome
D) familial intellectual disability

Question

A male has a defect in the X chromosome of the 23rd pair. As children, people with this syndrome experience symptoms that can range from mild to severe or even profound intellectual disability. This is known as ________.
A) fragile X syndrome 
B) Down syndrome
C) fetal alcohol syndrome 
D) familial intellectual disability

Quizplus · Accepted Answer

Fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome and is the most common inherited cause of intellectual disability. Symptoms can range from mild learning disabilities to severe intellectual disability and can also include behavioral and physical features such as autism spectrum disorder, anxiety, and elongated face and large ears.

A Male Has a Defect in the X Chromosome of the 23rd