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(D) The figure illustrates the molecular basis of sickle-cell anemia.In the normal hemoglobin $(HbA)$ peptide,the $6^{th}$ position is occupied by Glu

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Normal gene $\quad$ Sickle cell gene $\quad Glu \quad Val$

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(D) The figure illustrates the molecular basis of sickle-cell anemia.In the normal hemoglobin $(HbA)$ peptide,the $6^{th}$ position is occupied by Glutamic acid $(Glu)$,which is coded by the codon $GAG$.In the sickle-cell hemoglobin $(HbS)$ peptide,a point mutation occurs where $GAG$ is replaced by $GTG$,leading to the substitution of Glutamic acid $(Glu)$ with Valine $(Val)$ at the $6^{th}$ position.Thus,$P$ represents the Normal gene,$Q$ represents the Sickle cell gene,$R$ represents $Glu$,and $S$ represents $Val$.

Identify the given figure and select the correct option for $P, Q, R$ and $S$.
$\quad P \quad Q \quad R \quad S$

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Identify the given figure and select the correct option for $P, Q, R$ and $S$.$\quad P \quad Q \quad R \quad S$