Match List I with List II :List I List II A. Incomplete dominance I. Human skin colour B. Co-dominance II. Inheritance of flower colour in Antirrhinum sp. C. Pleiotropy III. Phenylketonuria disease in humans D. Polygenic inheritance IV. ABO blood groups
Choose the correct answer from the options given below :
| List I | List II |
|---|---|
| A. Incomplete dominance | I. Human skin colour |
| B. Co-dominance | II. Inheritance of flower colour in Antirrhinum sp. |
| C. Pleiotropy | III. Phenylketonuria disease in humans |
| D. Polygenic inheritance | IV. ABO blood groups |
Answer: (A) A-II, B-IV, C-III, D-I. Answer: (A) A-II, B-IV, C-III, D-I Solution: Incomplete dominance is exemplified by flower colour inheritance in Antirrhinum (snapdragon) where the heterozygote is intermediate (A-II).
- A.A-II, B-IV, C-III, D-I✓
- B.A-I, B-III, C-II, D-IV
- C.A-I, B-IV, C-III, D-II
- D.A-II, B-I, C-III, D-IV
Correct Answer
(A) A-II, B-IV, C-III, D-I
Solution & Explanation
Answer: (A) A-II, B-IV, C-III, D-I Solution: Incomplete dominance is exemplified by flower colour inheritance in Antirrhinum (snapdragon) where the heterozygote is intermediate (A-II). Co-dominance is shown by the ABO blood groups where IA and IB both express (B-IV). Pleiotropy, a single gene with multiple effects, is illustrated by phenylketonuria in humans (C-III). Polygenic inheritance is exemplified by human skin colour (D-I). This gives option (1). NCERT Reference: NCERT Class XII, Ch 4, p.60, lines 8-9: "The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum sp.) is a good example to understand incomplete dominance." (See also p.69 lines 27-31 for pleiotropy/phenylketonuria and p.61 lines 15-17 for co-dominance/ABO.)