All of these obey Mendel's laws except:

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(A) Among the given options, only codominance does not follow Mendel's laws.The phenomenon where both alleles of a gene pair express themselves simult

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Codominance

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(A) Among the given options, only codominance does not follow Mendel's laws.The phenomenon where both alleles of a gene pair express themselves simultaneously in a heterozygote is called codominance. As a result, the phenotype is distinct from both homozygous parents.Key points:$1.$ Codominance is an exception to the Law of Dominance.$2.$ $ABO$ blood grouping in humans is a classic example of codominance and multiple alleles.$3.$ The gene $I$ has three alleles: $I^{A}, I^{B},$ and $i$. $I^{A}$ and $I^{B}$ produce different forms of sugar, while $i$ produces no sugar.$4.$ When $I^{A}$ and $I^{B}$ are present together, both express themselves, resulting in blood type $AB$.Genotype of OffspringBlood Type of Offspring$I^{A} I^{A}$$A$$I^{A} I^{B}$$AB$$I^{A} i$$A$$I^{B} I^{B}$$B$$I^{B} i$$B$$ii$$O$Independent assortment and the law of purity of gametes (segregation) are fundamental Mendelian principles.

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