____________ occurs when a DNA series makes too many copies of itself and "turns off" a gene on the X chromosome.

Question

Quizplus · Accepted Answer

Fragile X syndrome is caused by a gene mutation where a DNA sequence repeats too many times, leading to the inactivation of a gene on the X chromosome. This results in intellectual disability, behavioral and emotional problems, and physical characteristics such as a long face and large ears.

____________ Occurs When a DNA Series Makes Too Many Copies