Blood Type O Recessive

December 09, 2020

The most common blood type and why. A dominant gene will hide the recessive gene.

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Rr r is the dominant gene in blood type a is dominant over o.

Blood type o recessive. We can now add blood type to our table. This is because a and b are dominant over o. That means that the only allele a person with type o blood can pass down is o.

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. O positive is the most common blood type present in 37 percent of the u s. What this means is that an ao blood type looks like a in a blood test and a bo like b.

O negative is the most common blood type used for transfusions when the blood type is unknown. Your parents could have type a b or o blood and still have a. Blood types vary by ethnic group with more hispanic people possessing o blood type while asian people are more likely to be type b.

A and b types only emerged in the last 20 000 years. Although type o comes from a recessive gene if one parent has a or b blood the child will be a or b o is the oldest type reports the bbc. Your brother s father also carries the recessive gene for the o blood type and he carries the same blood type despite having a different father.

The example below shows a cross between an individual with type a blood notice this individual carries the recessive o allele and an individual with type b blood who also carries the recessive. It is shown as a capital letter in the gene. 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.

The o blood type is recessive reina and so your mother and father both carried the o allele and you happened to get both copies. As a side note you may have noticed that the ab blood type is made up of an a version or allele of the abo gene and a b version. Meanwhile the universal red cell donor has type o negative blood type.

Type o blood type is caused by the recessive gene of o o alleles. This is why it is used most often in cases of trauma emergency surgery and any situation where blood type is unknown. Someone with b type blood must have the genotype b o so one that person s parents must have to have a b blood type or an a b blood type in order to pass that down.

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