Sad outcome: We are all thought to carry a few recessive genes that do affect us because they are balanced by a normal one. If have a baby with a sib who carries similar genes we have 25% or more risk of a baby with a genetic disease. A cousin would have fewer shared genes but some risk.The closer people are related the more at risk of a potentially fatal or severe genetic disease in their baby.
Answered 2/2/2014
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