A male has a thin,frail-looking area on his X chromosome of the 23rd pair.As children,people with this syndrome are typically mildly developmentally delayed but shift to severe or profound developmental delay as adults.This is known as _______.
A)fragile X syndrome
B)Down syndrome
C)fetal alcohol syndrome
D)familial retardation

Question

Quizplus · Accepted Answer

The description given matches that of fragile X syndrome, which is caused by an abnormality in the FMR1 gene on the X chromosome. This abnormality, known as a "fragile site," can be seen on the X chromosome through a special type of genetic testing. People with this syndrome typically have mild to moderate intellectual disability and other behavioral and physical characteristics, and their symptoms may become more severe over time.

A Male Has a Thin,frail-Looking Area on His X Chromosome