Which of the following exhibit codominance?

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$I^{A} i$

$I^{A} I^{B}$

$I^{B} i$

i i

answer is B.

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Detailed Solution

Co-dominance of the F₁ generation resembles both parents. Both the alleles of a gene are equally expressed. A good example is the different types of red blood cells that determine ABO blood grouping in human beings. ABO blood groups are controlled by the gene I. The plasma membrane of the red blood cells has sugar polymers that protrude from its surface and the kind of sugar is controlled by the gene. The gene (I) has three alleles I^A , I^B and i. The alleles I^A and I^B produce a slightly different form of sugar, while allele i do not produce any sugar. If a diploid individual has alleles I^A and I^B the blood group would be AB type.

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