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Originally Posted by metaphor-  Even though Adam and Eve sinned and became imperfect, Cain and his brothers and sisters were still so near to physical perfection that the children they produced did not suffer the same adverse effects as do children born of such unions today. |
The reason that there's a biological problem with incest is that it is more likely for two people who are related to both be carrying a damaging recessive trait. However, in your other thread, you say that you do not believe in evolution. If there is no such thing as genetic mutations (which is all that evolution is, really), then how can people now be so diverse if we all have the same genetic background? Wouldn't Adam and Eve risk passing on recessive traits just as much as anyone else if our genetic material is the same?