Is this unusual....my mom, brother, and sister all have the same blood typ?

Question

I have a completely differnet blood type. Do I have a different father then my siblings?

Answer 1

No, this does not mean you have a different father.
Lots of combinations are possible in blood types, and it is very common for most of a family to have the same type, except just one or two people.

Answer 2

So many misconceptions in the responses above me.
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You inherit your blood type from BOTH parents -

Period.

There are four basic blood types = A, B, O, and AB.

For most characteristics(exceptions for some missing from the y-chromosome), you have two chromosomes to determine the trait.

The genetic make-up of an O blood type is the absence of an A marker or B marker on the blood cells. So someone who is type O can be described as having two pairs of O alleles. It only takes 1 allele for expression of this blood cell marker.

We can describe it thusly:

The genetic make-up of an O blood type is OO.
The genetic make-up of an A blood type is AO or AA.
The genetic make-up of a B blood type is BO or BB.
And finally the genetic make-up of AB blood type is always AB.

O is the most common blood type and AB the rarest. And it is a good thing it is that way too, because O's can only recieve O blood in a transfusion. On the other end of the spectrum, AB blood type can recieve any blood - so it's fortunate that is the case being that it is the least common bloodtype around.

You've also no doubt heard it refered to as O-positive or O-negative and so forth. The positive and negative refer to yet another allele. And negatives, again just like the missing markers for O type blood, can only accept negative blood. The positives can take either.

Answer 3

It is not unusual for your Mom, brother, and sister to have the same blood type. One can not deduce from the information you have given if you would have a different father. To answer this question one needs to know what blood types your biological parents have, and whether they are positive or negative. Besides these factors there are what's known as "subsets" which simply are more specific blood markers. You need to give us some "givens" to work from to further help you out.

Answer 4

Yes, you were adopted.

Just kidding. Blood type can be hereditary, but it doesn't have to be the same as your parents. There are blood types that are more common than others, so your family is more than likely a replection of those statistics as well.

Answer 5

You have inherited your blood type from your father. The siblings have inherited from your mother. Do you know, or can you find out the blood type of your siblings' father? If you have that type, he is your father too.

I have two children with the same blood type as mine, A+. Both have the same father who is type O+.

Answer 6

You may have the same blood type as your father

Answer 7

That's not weird at all....you have to have either your mother or your father's blood type, so your siblings have your mom's blood type and you must have your dads

Answer 8

no, just because you have different blood types it doesn't mean you have a different father although it does seem weird that you would be the only one to be born with a differnt blood type.

Answer 9

what blood type does your dad have? If everyone in your family had the same expect for you i might worry. But you don't mention your dad.

Answer 10

You never mentioned your dad's type. Could his be yours?

My mom has A-blood, my dad has O something, and all my siblings and I have A-

Grin. Have you asked your mom this question???