Yes, in fact that is all they can have.
O is recessive, so each parent must have had an O gene from their mother and an O gene from their father. All they can pass on is O genes. They are O-O and all of their children are O-O.
Or if they aren't, you know what happened...
no
No
no
No!
MOTHER IS o+ father is A- the child will be which group
The father's blood type can be O, A, or B.
poiuyt
Yes. I am O positive and my husband is A positive. We have two A positive children and one O positive child.
in rare case yes.
Yes. If the father were BO+ and the mother were AO+, there is a 25% chance their child could be an O+.
Yes, it is possible for both mother and father to be RH positive and a child to be RH negative.
Yes.... because blood trait A is dominant on blood trait O... the child will then have blood group A