Which of the following is not an example of p | vedclass

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(D) Pleiotropy is a phenomenon where a single gene influences multiple,seemingly unrelated phenotypic traits.$1$. Phenylketonuria $(PKU)$ is caused by

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$AB$ blood group

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(D) Pleiotropy is a phenomenon where a single gene influences multiple,seemingly unrelated phenotypic traits.$1$. Phenylketonuria $(PKU)$ is caused by a mutation in the gene for the enzyme phenylalanine hydroxylase,leading to multiple effects like mental retardation,reduced hair and skin pigmentation.$2$. In pea plants,the gene controlling starch synthesis also influences seed shape (round vs. wrinkled) and starch grain size.$3$. Sickle cell anemia is caused by a mutation in the $\beta$-globin chain of hemoglobin,which affects the shape of red blood cells,leading to various systemic complications.$4$. The $AB$ blood group system is an example of codominance and multiple alleles,where the $I^A$ and $I^B$ alleles are codominant,but it does not represent pleiotropy.

Which of the following is not an example of pleiotropy?

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