Hello, I'm a genetic counselor with a background in biology and genetics. I can provide you with an informed answer regarding the biological implications of consanguineous relationships, such as those between siblings.

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The risk for passing down a genetic disease is much higher for siblings than first cousins. To be more specific, two siblings who have kids together have a higher chance of passing on a recessive disease to their kids. ... But usually they only cause the disease if both copies of a gene don't work.read more >>