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| List-$I$ | List-$II$ |
|---|---|
| $A$. $\text{ABO}$ blood group | $i$. Same phenotypic and genotypic ratio |
| $B$. Human skin colour | $ii$. Pleiotropy |
| $C$. Phenylketonuria | $iii$. Multiple allele |
| $D$. Incomplete dominance | $iv$. Polygenic inheritance |
| Column – $I$ | Column – $II$ |
|---|---|
| $(1)$ Failure of cytokinesis | $(p)$ To study inheritance of particular traits |
| $(2)$ Trisomy of $21$ | $(q)$ Polyploidy |
| $(3)$ Error of metabolism | $(r)$ Down's syndrome |
| $(4)$ Pedigree analysis | $(s)$ Phenylketonuria |
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