Regarding fragile X syndrome, which of the following statements is TRUE?
A)Fragile X syndrome is a sex-linked hereditary condition.
B)Fragile X syndrome results from a lack of an important enzyme and is linked to very low levels of dopamine.
C)Fragile X syndrome is a condition caused by an extra chromosome at pair 21.
D)Fragile X syndrome results from an insufficient supply of thyroid hormone.

Question

Quizplus · Accepted Answer

Fragile X syndrome is indeed a sex-linked (specifically X-linked) hereditary condition caused by a mutation in the FMR1 gene on the X chromosome, leading to a range of developmental problems including learning disabilities and cognitive impairment. It does not involve an enzyme deficiency, an extra chromosome, or a thyroid hormone insufficiency.

Regarding Fragile X Syndrome, Which of the Following Statements Is