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Originally Posted by This Is Not Here
I don't know whether it's possible with two parents of different ethnic origin with recessive genes and what have you
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It's possible between mixed race couples, yes.
Your scenario of a black and a white guy's sperm is also possible. It happened in The Netherlands in the 90s when a hospital fucked up (well, mixed up) an in-vitro fertilisation.
http://www.msnbc.msn.com/id/9438648