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If the mother of a child is blood type O+ and the child is A-, what blood type would the father be? Does the Rh factor of the child being - (negative) mean that one of the parents has to be negative? Both the parents are Rh - all of the siblings are Rh-as well. Could two Rh- parents give birth to a Rh+ child? and visa versa?

The father could be:

(a) A+, A-, or O-
(b) A+, A -, AB+, or AB-
(c) B+, B-, or O-

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