Answers:
If the disease is genetic, after probably. I vote just probably because even very twins can hold slightly different DNA due to mutation. But if the disease is an infection, an injury, or even cancer, it won't necessarily verbs. I speak cancer, because commonly times a gene may predispose you to a definite type of cancer but it may hold to be activate by environment, etc., to thieve place. If you could enlighten us what disease you're discussion roughly speaking we might be capable of abet you more.
I hope not