Which of the following is true of fragile X syndrome?
A) It occurs more frequently in males than in females.
B) It occurs only in females.
C) It makes a female XO instead of XX.
D) It results in XXY males.

Question

Quizplus · Accepted Answer

Fragile X syndrome is an X-linked genetic disorder, which means that the mutated gene responsible for the disorder is located on the X chromosome. Males only have one X chromosome, so they are more likely to be affected by the disorder. In females, the effects of the mutation are usually milder because they have a second X chromosome, which can compensate for some of the problems caused by the mutated gene. However, females can still be carriers of the disorder and pass it on to their offspring. The disorder does not result in an XO condition or XXY males.

Which of the Following Is True of Fragile X Syndrome