Paternity Test?

Biology Level 1

Is it possible for a man with Type AB Blood to be the biological father of a daughter with Type O Blood ?

Yes No

5 solutions

Varun M
Apr 23, 2016

This is how it works!!!!!!

Ashish Menon
Apr 22, 2016

Type AB blood has both antigens A and B, but O has both antibodies a and b. Now a and A are incompatible similarly b and B are incompatible due to which clumping occurs excessively and no such combination is possible.

You should've mentioned if the father was the biological father of the said daughter. On the other hand is a really good explanation of your idea.

Ada Dönder - 5 years, 1 month ago

Thanks for your second comment. And I think the first comment is directed at the problem poster. @Angela Fajardo though it is pretty obvious that by father you mean biological father, it is giod to mention it to prevent arise of doubts. Thanks @Ada Dönder and great problem Angela :+1:

Ashish Menon - 5 years, 1 month ago

Edited it. Thanks :)

Angela Fajardo - 5 years, 1 month ago

@Angela Fajardo – Looks great now :)

Ashish Menon - 5 years, 1 month ago

Isn't it the case that blood type is genetics though? The father could carry a recesive gene for O type blood and pass that on, right?

Amol Garg - 5 years, 1 month ago

Yes, one question arose in my mind:- Is O+ recessive or dominant. I know tha5 O is is, but whej rh antigen is connected I am not sure XD

Ashish Menon - 5 years, 1 month ago

We don't know if the blood is positive or negative. The question just says O and O-Neg type is recessive

Amol Garg - 5 years, 1 month ago

@Amol Garg – Yes, but what about O+ ? In our solution, we might have to be aure of that case before telling that AB is dominant over O, right?

Ashish Menon - 5 years, 1 month ago

@Ashish Menon – Guess that the whole gene is recessive so both answers work. http://www.cccoe.net/genetics/blood.html

Amol Garg - 5 years, 1 month ago

@Amol Garg – Are you sure that O+ is recessive. If yes, thank you very much for information. If no, then plz reconsider. :-)

Ashish Menon - 5 years, 1 month ago

@Ashish Menon – Haha... Just realized that if the father has AB blood then he carries phenotype for A and B. There's no chance that he has O recessive in the first place. Thanks for the replies guess this solves that problem. :)

Amol Garg - 5 years, 1 month ago

@Amol Garg – Oh my gosh, didnt see that coming. So, there is no concept of blood group O here, right?

Ashish Menon - 5 years, 1 month ago

@Ashish Menon – Nope haha :)

Amol Garg - 5 years, 1 month ago

@Amol Garg – Good job! :+1:

Ashish Menon - 5 years, 1 month ago

Antigens are related to antibodies but the dominance should also matter genotype OB possible without clumping.

Aditya Oke - 5 years, 1 month ago

Chew-Seong Cheong
Apr 24, 2016

Different versions of a gene are called alleles. Alleles are described as either dominant or recessive depending on their associated traits. Blood type A and B alleles are dominant while O allele is recessive. When a person has A allele in a chromosome and O allele in another chromosome, he will have type-A blood, similarly, BO allele pair gives type-B blood. Of course AA and BB give type-A and -B blood respectively and AB gives type-AB blood. A girl with type-O blood must have both O alleles, one each from her father and mother. A man with type-AB blood does not have O allele, therefore he cannot father a type-O blood offspring.

Aditya Oke
Apr 23, 2016

A & B are dominant traits in the blood group AB. So either A or B will be passed to the daughter by the father. Irrespective of the blood group of mother A & B are dominant over other blood groups. Even if mother has genotype OO, A or Bill be dominant. Since O is recessive it will not be expressed by the daughter.

A Former Brilliant Member
May 10, 2016

AB x O -> BO / AO Becouse father don't have blood type O

That's right, if any parent has AB blood group, then the offspring cannot have O blood group.

Pranshu Gaba - 5 years, 1 month ago