I thought the defects thing was overblown, but this is what wiki says:
A 1994 study found a mean excess mortality with inbreeding among first cousins of 4.4%.[54] A study of 29 offspring resulting from brother-sister or father-daughter incest found that 20 had congenital abnormalities, including four directly attributable to autosomal recessive alleles.[55]
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Date: 14/7/11 01:51 (UTC)A 1994 study found a mean excess mortality with inbreeding among first cousins of 4.4%.[54] A study of 29 offspring resulting from brother-sister or father-daughter incest found that 20 had congenital abnormalities, including four directly attributable to autosomal recessive alleles.[55]