Is it possible to have a different blood group to both of your natural parents ?

Answer 1

Most definitely. Here is a chart of all possible combinations:

parents blood types / your possible blood types
A, A = A, O
B, A = A, B, AB, O
AB, A = A, B, AB
O, A = A, O
B, B = B, O
AB, B = AB, A, B
O, B = B, O
AB, AB = A, B, AB
O, AB = A, B
O, O = O

Fixed the error thanks for pointing that out!

Answer 2

Yes it is possible and indeed occurs very frequently.

There is only one situation when it is impossible. If both parents have blood group O, then they both have the genotype OO, can only produce gametes with an O allele and therefore all offspring will also be blood group O.

Also, in the rare case that parental blood groups are both AB then blood group O is impossible, as neither carries O. In this case AB x AB will produce offspring of AA, AB or BB - groups A, AB and B respetively.

Otherwise blood groups are associated with the following genotypes:

A; genotype AA or AO
B; genotype BB or BO

gametes can carry only one allele, so there are quite a few combinations:

e.g. AO x BO could produce offspring with AB, AO, BO, or OO which would carry blood groups AB, A, B or O.

I am sure you can work out the full range of combinations for yourself, but rest-assured that it is quite normal to have a different blood group from one or both parents.

Answer 3

yes indeed. For exaple, if your dad was blood group A and mum B. If their respective genotypes are AA and BB then you would most certainly be blood group AB. If the genotypes were AO and BO, then you coul be blood group A, B, AB or even O.
however, it is not possible for both your parents to be blood group AB for instance and you are blood group O.
Also if your mum was group O and your dad was say AB and you turned out to be O - mum might need to answer some questions.
Blood group inheritance follows simple mendelian laws. Google Gregor Mendel to understand the concepts better

Hope this is explanatory enough!

Answer 4

It is possible to be 0 negative, and to have parents that are a or b positive as 0 and negative are both on recessive genesso it means that your parents would have AO, BO and +- genes

Answer 5

www.bloodbank.com has a very cool page that shows you the general possibilities, but it says GENERAL, so without DNA don't judge based on blood type alone.

Here is the link, the charts are about half way down the page

http://www.bloodbook.com/inherited.html

Answer 6

Deadman made a small error:
There can be no O children when a parent has AB
AB, A = A, B, AB
AB, B = AB, A, B

Answer 7

yes

Answer 8

yes, otherwise i'd have a few questions for my parents...

Answer 9

I just seen your window cleaner on a plane.