May someone explain why the answer is E?
Thank you in advance 
hey, it is said that the X has the condition so for example it is (aa). for this to happen, U must have one (a) because one allele comes from it ,so 100% is a carrier because the question mentioned only R and X have the condition so considering U to have the condition (aa) is incorrect . for the S and T is obvious (1/4 AA) and (1/4 aa)and (1/2= 50%) Aa (carrier)
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Ook, i get it now. Thank you!!