In some cases the gene comes in three different alleles. One example is human bl

Question

In some cases the gene comes in three different alleles. One example is human blood groups which is affected by a single group with three alleles: O, A and B. O is recessive, so the only way to be blood group O is to have two O alleles. A and B are dominant, so AA and AO individuals are blood group A, while BB and BO individuals are blood group B. A and B are "codominant" with each other, this means that AB individuals end up in the AB bloodgroup.

Imagine two parents, one of whom is in the O blood group and the other is in the AB blood group. What blood groups could their child have? Answers:

O

AB

A

B

Explanation / Answer

If one of the parents have O blood group and the other have AB blood group then the blood group of their child would be either A or B. There are 50% possibilities of having a child with blood group A and 50% of B because A and B are dominant over O.

However with some exception the blood grouos can also be AB or O itself but rarely.

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