What are the odds of having a different blood type than my father?

Question

My father and I have different blood types, what are the odds of that happening, if I remember correctly blood tests were done to determine paternity, before DNA tests were available.

Answer 1

A blood test could sometimes tell if they aren't the father but they can't tell if they are.

A child gets 1 A, B or O blood type from each parent. A and B are dominant and O is recessive. Here is a chart that will show you all of the options

Mother with blood type A + Father A= child with A or O
Mother A + Father B = child with A, B AB or O
Mother A + Father AB = child with A, B or AB
Mother A + Father O = child with A or O

Mother B + Father A = child A, B, AB,O
Mother B + Father B = child B or O
Mother B + Father AB= child A, B, or AB
Mother B + Father O = child B or O

Mother AB + Father A = child A, B or AB
Mother AB + Father B = child A, B or AB
Mother AB + Father AB = child A, B, or AB
Mother AB + Father O= child A, B, or AB

Mother O + Father A = child A or O
Mother O + Father B = child B or O
Mother O + Father AB = child A or B
Mother O + Father O = child O

Notice that if both parents have O blood then the child has to have O. If even one parent has AB blood the child can NOT have O blood even if the other parent does.

This is how they could tell with blood tests that a man wasn't the father but they can't tell for sure if a man IS a father just on blood type alone, one would need a DNA test to determine that.

Answer 2

The odds depend on the blood type of your parents. In fact some combinations of parents can have a child with any of the 4 types. Every person has two copies of the blood type gene, one from each parent. Each copy can be either an A, B, or an O. The blood test doesn't actually detect the O version - an O result just means the absence of A or B. So if you have 2 copies of A -- or one A and one O -- then you are Type A. Similarly B/O or B/B are both Type B. Only 2 copies of O makes a Type O. So an A/O father with a B/O mother could have any of the 4 types! (A/O, A/B, B/O or O/O). The blood test can not really prove paternity but it can disprove it in some cases. For example an AB man has one copy of A and one copy of B so he can not father a Type O child - the child would have to get either an A or B from the father. Similarly, a type O man could not have fathered a Type AB child. If you do believe you have an impossible combination remember that mistakes can be made in testing, and that many people have strong family love without biological relation.

Answer 3

That's pretty normal, blood test only provided a possibility of paternity! Your Mother has a blood type and so does your Father. The possibility of you having the same type, I would say is slim to none. DNA is the best way to determin paternity!

Answer 4

Hmm, I even have by no skill heard something like that. although, i'm O neg and my husband is A pos. because of the fact i'm O neg (no count if or no longer they new my husband's blood form or no longer) I had to take delivery of a Rhogam shot because of the fact i'm seen RH destructive. the placement is that at start the newborn's blood would possibly no longer combination precise and that they'll require a transfusion. With the shot at a definite degree in being pregnant it is going to evade any issues. Then as quickly as the newborn is born, finding on their blood form, the mummy might acquire yet another shot (if the newborn has a destructive blood form). My daughter became into born A pos like my husband so i did no longer % yet another shot.

Answer 5

You could have inherited it from your Mother, your Father, or anyone else in the bloodline with a recessive gene that pushed it's way up to the front when your time came.
Yes, previously blood tests were used for paternity... and a lot of false impressions were made. Fortunately, nowadays we do have DNA testing with a much higher degree of confidence.

Answer 6

It depends.
There are three "types" of Blood Types: A, B, and O. You can have both of the same (AA, etc.) or a combination of the two (AB, etc.).
So, the odds depend on whether your father has both the same or a combination of two.
It can happen, though- I have a different blood type than my father.
Sorry I can't give you an exact answer.

Answer 7

Probably 50 %, as your mom's genes helped to make you just as much as your dad's. Their are also recessive genes. For example, your parents could both have type A blood, but one or both of them could have a recessive O blood type. You would have a chance to have type O blood.

Answer 8

it's actually likely! It depends on what he is.

Everyone has 2 components of their blood, 2 of A,B and O.
Usually the O gets dropped for shrothand when we talk about type eg A(O), BO), AB and O(O).

You get one component from your mum and one from your dad. I won't list all of the variation here, but as an example-
my mum is AB
my dad is O(O)
I am A(O), and my siblings can be A(O) or B(O), but not AB or O(O)

Answer 9

i'd like to know too..........blood types info has changed dramaticallyi don't understand it but years ago a lecturer from u of japan gave a lecture that put an entirely different prospective on these catagories

Answer 10

do you have your moms blood type? I'm not really sure but maybe your adopted or hes not your real father question him find out