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

Expert Answers
sullymonster eNotes educator| Certified Educator

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 -.

atyourservice | Student

Yes, because both parents could have a recessive gene for the O blood type, and when a person is Rh+ they can either have a + child or a - child. So yes it is very possible.

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