Fragile X syndrome is a genetic disorder that is a major cause of intellectual disability. It is caused by a mutation in the FMR1 gene on the X chromosome, and as such, is more common in males. It is not a type of polygenic inheritance, but rather a single gene mutation. The mutation is in the DNA, not the RNA.

Solved

Fragile X Syndrome

Question 43

Multiple Choice

Fragile X syndrome

A) is a major inherited cause of mental retardation.
B) is a type of polygenic inheritance.
C) occurs with a RNA mutation.
D) occurs more frequently with females.

Correct Answer: