But if you have potential genetic conditions that you don't want to pass on.....you would still be passing it on...but for some law to deal with.
It's bonkers doesn't even make sense.
There is no double whammy.
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"Double whammy" ?!?
I think you are a GF, OP
You can't ever get a perfect child so stop being so silly.
'Children of a highly antisocial parent (i.e. a parent with high aggression, irritability and a history of illegal activites) are at increased genetic risk for displaying antisocial behaviour (e.g. lying, fighting, having a hot temper). This genetic risk is present, of course, even if the highly antisocial parent (usually the father) is completely absent from the home and the child is raised by the other parent. However, as Sarah Jaffee and co-workers (2003) found, when high-antisocial fathers live at home and are involved in caretaking, this further increases children's antisocial behaviour and risk of developing a conduct disorder. In contrast, when low-antisocial fathers live at home and participate in caretaking, this tends to decrease children's antisocial behaviour. Jaffee and co-workers concluded that children of high-antisocial fathers who are involved in caretaking receive what they call a 'double-whammy' of genetic and environmental contributions to their own antisocial behaviour.'
(Holt, Bremner, Sutherland, Vilek, Passer, Smith, Psychology: The Science of Mind and Behaviour, 2nd Ed., 2012, p. 495)
I must admit I have no idea what the nature/nurture situation is with anxiety (/neuroticism), though.
I though when quantified it was something like 40% they generally come in around
Pretty much. 
'[G]enetic factors accounted for approximately 40 to 50 per cent of the variance among people in [personality] trait scores.'
(Ibid., p. 586)