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Originally Posted by Graham
So take a complete medical history and a genetic sample that can be tested for possible congenital conditions before the sample is put into the "gene bank" (or, indeed, kept on file for subsequent use if new tests are developed).
There's no need that I can see for the "father" to be involved in the process, nor, indeed, traceable, after that.
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Or, take a gene sample of the actual person, and then you'll be able to say for definite if that person is going to suffer from some genetic disease or not.
Even if your dad had some genetic disease, it doesn't mean you definitely will, only a gene test on your genes will show that.
So genetic history isn't really all that useful.
(remember gene tests show recesive genes too, so nothing can hide away to crop up later)