Adenine always pairs with Thymine, and Cytosine always pairs up with Guanine in DNA. When dealing with RNA, however, Uracil replaces Thymine. So in RNA, A pairs with U and C pairs with G. (just a fun fact) :)
Answer: A transposable element is introduced into the regulatory region of the eye color gene and causes gene expression to be reduced, which results in white eyes with red spots
