One studies a disease caused by a single point mutation in which a restriction enzyme site is gained by the mutation. To determine if someone is a carrier of the disease, PCR primers were generated which allowed a 1.8 kb fragment to be amplified across both X restriction sites in the normal gene. After treatment of the amplified DNA by enzyme X, a carrier of the disease would be expected to exhibit which size fragments, as determined by ethidium bromide staining of an agarose gel? (A) 1.5 kb only (B) 0.6 and 0.9 kb (C) 0.6 and 1.5 kb (D) 0.6, 0.9, and 1.5 kb (E) 0.9 and 1.5 kb
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