Blood typing.

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Type B is dominant over type O, so it is possible that someone who is type B either has two genes for type B blood or one for type B and one for type O. Similarly since Positive is dominant over Negative, someone who is RH-positive could have either two genes for Positive or one for Positive and one for Negative. So if the parents are both BO+- they could have children of type B+, B-, O+ or O-. And even *that* isn't completly guaranteed. The Genetic mutations between types O,A & B are very very rare, but not unheard of.Naraht (talk) 20:58, 22 January 2012 (UTC)Reply

February 2012

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