If the blood groups of the parents are this: Father A+ and Mother ARH+, can their female child be blood group O-?

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The main blood groups are A and B, but both these groups carry alleles for the O group.  It is a recessive trait, as are blue eyes.  Just as two parents with brown eyes can have a blue-eyed child, two A+ parents can have an O- child.

The + and...

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The main blood groups are A and B, but both these groups carry alleles for the O group.  It is a recessive trait, as are blue eyes.  Just as two parents with brown eyes can have a blue-eyed child, two A+ parents can have an O- child.

The + and - refers to the Rh factor.  If a person is Rh+, his offspring can either be positive or negative.  However, if a person is Rh-, then the offspring can only be -.

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