Question

can we imagine blood group through pungent square

Answer 1

Yeah..can be identified by punnett square method.
Here, in the ex, we can see that there are equal chances(50%-50%) of both A and O blood groups.

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Answer 2

Yes we can I am giving you one example for this.

Parent blood type AB has the codominant has iA and iB alleles.

Parent of blood type O is homozygous recessive for the i allele.

Genotype of their offspring could be
I A i. Or I B i.

Refer an image attached.