On the other hand, when Mystique coupled with Sabretooth, an equally powerful mutant in his own animalistic right, the result was quite different. In this instance, the pairing of two fairly potent mutants gave the world the mutant hating Graydon Creed, a baseline human with no potential for mutant abilties. In a reaction to his lineage, which was not confirmed until he was much older, he became the founder of the anti-mutant organization the Friends of Humanity and much later (after his death and resurrection) he became part of Bastion’s inner circle.
Just proof that genetics are not everything, and that the insanity gene passes just as easy (if not easier) then the mutant gene. Perhaps in the future mutants looking to have mutant offspring should also look into a psych profile as well as a genetic profile.