Match List I with List II : List-I A. Incomplete dominance B. Co-dominance C. Pleiotropy D. Polygenic inheritance List-II I. Human skin colour II. Inheritance of flower colour in Antirrhinum sp. III. Phenylketonuria disease in humans IV. ABO blood groups Choose the correct answer from the options given below :
- 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.)