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The genotype that illustrates codominance of alleles that control blood type in humans is IAIB
A genotype is the genetic make up of an organisms, it is a set of genes in our DNA which is responsible for a particular trait. The phenotype on the other hand is the physical expression, or characteristics, of that trait. Codominance is a form of dominance where the alleles of a pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is nether dominant nor recessive. 

[tex]\bold {I_A \ I_B}[/tex]  genotype illustrates the codominance of alleles that control blood type in humans.

What is codominance?

When two dominant alleles express simultaneously in an organism, the inheritance pattern is called codominance.

For example - In humans, two blood groups determining alleles [tex]\bold {I_A \ I_B}[/tex] express simultaneously, the person has an AB blood group.

Therefore, [tex]\bold {I_A \ I_B}[/tex]  genotype illustrates the codominance of alleles that control blood type in humans.

Learn more about codominance:

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