Blood Type Ab Phenotype

March 14, 2021

Occasionally the blood types of children are not consistent with expectations for example a type o child can be born to an ab parent due to rare situations such as bombay phenotype and cis ab. Blood type o is recessive so a child will only have this blood type if he or she gets two o blood type genes from his or her parents.

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Tests on 250000 blood donors show the frequency of lu a b to be approximately 1 in 3000.

Blood type ab phenotype. Caucasian cases were more likely to be blood type a or o whereas cases of unknown and other races were more likely to be. Blood type o is always recessive so it requires two copies of the o allele for an offspring to demonstrate the o phenotype. Blood type was not associated with any clinical covariate with the exception of race.

It is a phenomenon called cisab where the a and the b are encoded into one gene. Thus a person who inherits an a allele and a b allele will have type ab blood and make both a and b blood cells. The families of 41 propositi show the dominant inhibitor of lutheran antigens in lu to be the us.

Blood type ab is both the genotype and the phenotype as neither a nor b are dominant. The rare blood group phenotype lacking lutheran antigens lu a b is known to have two genetic backgrounds.

You can also carry the o recessively if you are ab but that is rare. There are four major blood groups determined by the presence or absence of two antigens a and b on the surface of red blood cells. Blood types a and b are co dominant so if the father has blood type aa and the mother has blood type bb the child will have a blood type of ab.

Blood types a and b are codominant to each other meaning that if a person inherits the a allele from one parent and the b allele from the other parent both traits will be expressed and the offspring will have ab blood. The a blood type contains about 20 subgroups of which a1 and a2 are the most common over 99. Two more important terms when discussing inherited traits are phenotype and genotype.

Blood type from emr linked laboratory assays included 312 type a 45 0 85 type b 12 2 39 type ab 5 6 and 258 type o 37 2. In addition to the a and b antigens there is a protein called the rh factor which can be either present or absent creating the 8 most common blood types a a b b o o ab ab.

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