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(B) The phenomenon described is $Codominance$. In $Codominance$, both alleles of a gene pair express themselves equally in the $F_1$ generation, meani

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Blood group

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(B) The phenomenon described is $Codominance$. In $Codominance$, both alleles of a gene pair express themselves equally in the $F_1$ generation, meaning neither allele is dominant or recessive over the other. A classic example of $Codominance$ in humans is the $ABO$ blood group system, specifically the $AB$ blood type, where both $I^A$ and $I^B$ alleles are expressed simultaneously. $Mirabilis$ $jalapa$ (Four o'clock plant) exhibits $Incomplete$ $Dominance$, not $Codominance$. $Pleiotropism$ refers to a single gene influencing multiple phenotypic traits. Therefore, the correct answer is $Blood$ $group$.

When two genes with independent expression are present together, they both express their characteristics, and when they are separate, they express their individual characteristics. This phenomenon is observed in which of the following?

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