Can two parents who are ab+ have a child who is b+?

Question

I think the answer is yes but I don't know. A friend of mine has 3 children, 2 are ab+ but the last child is b+ Both he and his wife are ab+ He's just wondering if you know what I mean.

Answer 1

Each child gets one gene from each parent...so the ab+

ones got an a from one and the b from the other (a from mom b from dad or b from mom and a from dad).  the B+ got the B from both parents.....they could also have an A+ child, getting the A from each parent.

  Its not an "AB" gene... it is an "A" gene and a "B" gene.  Having one of your 2 genes for blood type being A and one being B gives you AB blood type.  But sperm and eggs only carry half of your dna, so they only get one from you.  Then they get the other from your partner.  Having B blood type would mean either both of that childs  genes for blood type are B, or one is B and one is O(o is recessive.....o blood type is only when both genes are o).  Since both parents are AB they would have each passed that child a B gene.            

Type AB blood = A+B

Type A blood = A+A or A+O

Type B blood = B+B or B+O

Type O blood = O+O

Answer 2

The answer is they could have AB or A or B type children, but it would be impossible to have O type.  If the husband were O and she AB, then whatever gene the father carried with O would be the blood type for the baby, either A or B, but not AB

Answer 3

yes, the above answers cover it nicely.

Answer 4

Yes, you each passed along a B to your child.

Answer 5

Humans have two protiens covering in blood.

A & B.

Those who have both covering in blood A & B have AB group

Those who have no covering in blood (niether A nor B) have O group

Those who have only A type of covering ( Either as both A(AA) or as One A & no second covering (AO) ) have A group

Those who have only B type of covering ( Either as both B(BB) or as One B & no second covering (BO) ) have B group.

Now we get one covering from each parent.

Now if both parents are AB,

it means both of them can give to their offspring either A or B.

So, possible combination are

AA  ~ A group

AB  ~ AB group

BA  ~ AB group

BB  ~ B group

So, there is 25 % chances that baby can get B group.

there is 25 % chances that baby can get A group.

there is 50 % chances that baby can get AB group.

So, it is possible