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Originally Posted by Radium
What DD is saying, though is that that's only in humans. Animals tend to incest fine.
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Not really. They may be able to keep it going for a little while longer than humans, but eventually it will make them more vulnerable to certain diseases and stuff, causing all of them to be wiped out when an epidemic hits. Other animals have just as much benefit as humans when mixing the populations now and then.
So basically: Spaz + Lori = no children please
Jerry: every animal has a few faulty genes on a chromosome. Because chromosomes come in pairs, the animal usually has a chromosome with the healthy gene to make up for it. If the animals are related though, they might have the same faulty gene on the same chromosome. If both of them would pass this faulty gene to their child, the child would be left with a pair of chromosomes that both have the faulty gene, without a healthy gene to make up for it. This would cause the child to have some kind of defect. Therefore, Spaz and Lori would probably have handicapped babies.