AB & O or - blood types?

Question

ok so i am an AB and my mom is a AB- . i know my dad is an O but is he a - or which is based upon the rh factor . i tried 2 figure it out but i could not . i guess you could c which one he is by looking @ my blood type>

Answer 1

the alleles

IA

IB

i (recessive)

ii=O

I(A) I(B)= AB

I(A) I(A)= A

I(B) I(B)=B

I(A) or I(B) mixed with an i gives A or B (respectively)

you and your mom are AB, so I(A) I(B)

your mom passed you an I(A) or an I(B), but only one.  You have them both, so one came from your mom, the other from your dad.  Your dad can't be O, because he would have passed you an i, and you would be either type A or B.  If your dad is A, he could have passed you an I(A) and your mom has an I(B) she could have given you.

rhesus (rh) is different

Mom is negative, so she is homozygous recessive

If dad is also negative, then you are negative.

If dad is homozygous +, then you are + (but heterozygous)

If he is heterozygous +, then you are + or -.

hope this helps

Answer 2

The Rh factor (+ or -) is actually several alleles (the one named 'D' is dominant) so it is difficult to tell from you parents phenotype.  If I had to guess though, you would likely be negative given this information. Get a blood test to know for sure.

As for the ABO groups...someone with a blood type O cannot have a AB child (the child must inherit a i allele, the O or null).

Either you have the blood types wrong, your father is not your genetic father, or he has an extremely rare blood type that results in O regardless of the actual genotype (mutation in another gene, H).

Answer 3

He's probably a positive, if you are a positive.  Two negatives always have a negative child, but to have a positive child, one of the parents has to be positive.  There's a lot of subtleties, though, with alleles, etc. that account for a lot of variations.

It's usually not possible for an AB parent and an O parent ot have an AB child, though, unless you have some really wild allele combinations going on.  Usually, an AB child with one AB parent has another parent with an A, B or AB.

The following source explains it very clearly.  

Answer 4

Umm..

I absolutely hate to say this, but it is utterly impossible for your Dad to be type O if you're type AB.

So either you're not AB, or he's not your Dad.

Just in case you want farthur explanation why..

You get one allele from each parent to create your genes.. The allele is the "A, B, O, etc".  Type O is recessive, which means that both of the alleles in a person who has type O blood have to be O.  The A and B alleles are co-dominant.  This means that basically they're both dominant over O, but they're equally dominant to each other.  When parents.. "create" a baby, there is an equal and random chance of them donating either of their alleles to the baby.

Therefore, your Mom could have either donated an A allele or a B allele.

Your Dad, being type O, only has O alleles, so he can only donate an O to you.

Since you get one from each parent, and O is recessive, you can only be either type A (with your alleles being AO) or type B (with your alleles being BO).

The rh, or rhesus factor, is another factor entirely.  The rhesus factor is a small protein that can be found on your red blood cells.  You either have it or you don't.  If you have it, you're positive, if you don't, you're negative.  It is completely unrelated to whether you're AB, O, etc.

The negative is recessive to the positive for the rh factor.