Match List-I with List-II. List-I (Type of cross): A. Monohybrid Cross B. Dihybrid Cross C. Incomplete dominance D. Test Cross List-II (Phenotypic ratio): I. 1 : 1 II. 1 : 2 : 1 III. 3 : 1 IV. 9 : 3 : 3 : 1 Choose the correct answer from the options given below:
Answer: (C) (A)-(III), (B)-(IV), (C)-(II), (D)-(I). Answer: (C) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) Solution: A monohybrid cross gives an F2 phenotypic ratio of 3:1 (III); a dihybrid cross gives 9:3:3:1 (IV); incomplete dominance gives 1:2:1 (II); and a test cross gives 1:1 (I).
- A.(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
- B.(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
- C.(A)-(III), (B)-(IV), (C)-(II), (D)-(I)✓
- D.(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
Correct Answer
(C) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
Solution & Explanation
Answer: (C) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) Solution: A monohybrid cross gives an F2 phenotypic ratio of 3:1 (III); a dihybrid cross gives 9:3:3:1 (IV); incomplete dominance gives 1:2:1 (II); and a test cross gives 1:1 (I). Therefore the correct matching is A-III, B-IV, C-II, D-I, which is option (3). NOTE: the provided answer key letter 'C' (i.e., option 3 in this numbered set) corresponds to this correct mapping; option text (3) is the right one. NCERT Reference: NCERT Class XII, Ch 4, p.55, lines 30-32: "only one of the parental traits was expressed in the F1 generation while at the F2 stage both the traits were expressed in the proportion 3:1." (dihybrid 9:3:3:1 on p.64 lines 4-6; incomplete dominance 1:2:1 on p.60 lines 14-15; test cross 1:1 on p.58 lines 33-37).