Match List – I with List – II.
| List - I | List - II |
| (A) Aneuploidy | (I) AB blood group |
| (B) Co-dominance | (II) Sex linked recessive disorder |
| (C) Pleiotropy | (III) Down's Syndrome |
| (D) Colourblindness | (IV) Phenylketonuria |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
(A) Aneuploidy — this matches (III) Down’s Syndrome. Gain of one chromosome.
(B) Co-dominance — this matches (I) AB blood group. Both alleles expressed.
(C) Pleiotropy — this matches (IV) Phenylketonuria. One gene, many effects.
(D) Colourblindness — this matches (II) Sex linked recessive disorder. Gene on the X chromosome.