Which of the following is TRUE with regard to fragile X syndrome?
A)The physical appearance of children with fragile X syndrome is markedly altered.
B)Mental abilities are relatively normal in individuals with fragile X syndrome.
C)This disorder occurs more frequently in males than in females.
D)This disorder is caused by the missing X chromosome in humans.

Question

Quizplus · Accepted Answer

Fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome, making it an X-linked disorder. This means that it occurs more frequently in males because they have only one X chromosome, while females have two X chromosomes and the normal copy of the gene on the other X chromosome may help compensate for the mutated copy.

Answer: B
 Mental abilities can be affected in individuals with fragile X syndrome. It is the most common known cause of inherited intellectual disability and can range from mild to severe. Other common symptoms can include social anxiety, hyperactivity, and sensory sensitivities.

Answers A and D are incorrect. The physical appearance of individuals with fragile X syndrome can be more subtle and less distinguishable than in some other genetic disorders, and it is not caused by a missing X chromosome.

Which of the Following Is TRUE with Regard to Fragile