Fragile x syndrome is a sex-linked disorder found mostly in boys, characterized by mental impairment, large ears, a long face, heart defects, and flat feet. it is caused by a mutation to the gene shown in the picture above. the codon cgg is abnormally repeated many times, causing the cell to inactivate the gene. such a mutation is known as a(n)
a) insertion.
b) inversion.
c) deletion.
d) duplication.