A man who has an AB blood group can not be a father of a child with an O blood group as he would pass on either the A or B alleles to the offspring.
- A man who has an AB blood group can not be a father of a child with an O blood group as he would pass on either the A or B alleles to the offspring.
- ABO blood groups cannot be used to confirm whether a man is a child's father.
- If a person's ABO blood type is O, he or she has two O alleles. If a person's blood type is A, he or she has either two A alleles or one A allele and one O allele.
- If a person has type B blood, this indicates the presence of either two B alleles or one B allele and one O allele. Finally, some people have type AB blood, which means they inherited both an A allele and a B allele.
- The best-known blood-typing system is ABO typing, which involves the presence of antigens on red blood cells encoded by the ABO locus on human chromosome 9.
- In the ABO system, the A allele and the B allele are codominant, and the O allele is recessive.
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