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The reasons people inbreed is due to basic genteic concepts. Two siblings are colsely related and are more likely to be heterozygous for a particular trait. If bred together you increase the probability of said trait. That can be anything from the mundane to the malignant. Hence if two offspring from one pairing where an individual was homozygous for a trait, than the siblings , if bred together , are more likely to produce that desired trait. If one isn't heterozygous for the trait however, than the trait isn't passed on.
[addsig]
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