We dont know that much about genetics to say definite yes or know but many breeders will tell You that the high Quality normal will affect outcome of morph... i know few ppl who when they breed multigene male to normal female they make sure that female will be really nice example...
I think with selective/line breeding You will get darker and darker normals with will enhance later dark morphs like sable black pastel or cinny....
Good luck with your project and keep us posted
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