Child resembling father or mother (Hadith clarification)

> And if a man's discharge proceeded that of the woman, then the child > resembles the father, and if the woman's discharge proceeded that of > the man, then the child resembles the mother." Okay, isn't the above hadith totally unscientific? Because we know that resemblance is actually implemented by DNAs and genes, not due to the fact who has orgasm first.