O Blood Type Phenotype

November 08, 2020

Blood type o is always recessive so it requires two copies of the o allele for an offspring to demonstrate the o phenotype. 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.

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The gene for blood type b is dominant the father has the phenotype b but can have the.

O blood type phenotype. Unlike many traits in humans it s thankfully quite simple to figure out the genetics behind someone s blood group as the letter and are each dictated by a single gene. 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 type. Blood type is defined by the presence of one both or neither of the a.

The mother can only have the phenotype o if she has the genotype oo. The gene for blood type o is recessive. 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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