Yes: Changes in genes can occur spontaneously. You could say that genetic disease has to start with some one and then get passed on. Frequently however one or both parents are carriers for a condition and pass it on to their child.
Answered 10/8/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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