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

Question

In some cases, the gene comes in three different alleles. One example is human blood groups which are 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 blood group.

Imagine two parents, one of whom is blood group A and the other is blood group B, but you don't know whether the parents are heterozygotes or homozygotes (assume there is a 50/50 chance of either zygosity). Which of the following genotypes could their children possibly have?

Options:

AA

AB

OB

OO

Explanation / Answer

All the given options are correct the phenotype of a cross can be anything .

AA x BB = AB

Ai x BB = AB ,Bi

Ai x Bi = AB , ii

( A = blood group A ,B = blood group B , i = blood group O)

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