Ok, everyone that paid attention to DBZ understands that humans and saiyans can reproduce and when they do, a half-human/half-saiyan is born. In DBGT(non-canonical) and DB: A Hero's Legacy(also non-canonical), we see the Saiyan bloodline extremely diluted.
My question is, why is only the saiyan blood diluted when a human and saiyan reproduce. Based on the basic crossbreeding laws, the full blooded saiyan and the full blooded human will always produce a half-saiyan/half-human. However if a half-human/half-saiyan breeds with a half-human/half-saiyan, there's a 50/50 shot at reproducing another half-saiyan/half-human.
So, my question is, if they were to continue to reproduce, wouldn't it be the human blood that eventually diluted itself out and the saiyan blood become pure once again? Thus leading to the reemergence of the saiyan race? Or am I just too ignorant about crossbreeding?