Dihybrid Cross Ratio 9:3:3:1 — NEET Biology

Correct answer: D — A-III, B-I, C-IV, D-V, E-II

The core concept tested is the correct association of dominant traits studied by Mendel in pea plants with their corresponding genetic symbols. A. Tall stem height: According to Mendel's work, tallness (T) is dominant over dwarfness (t). So, A matches III (T). B. Green pod colour: Green pod colour is dominant over yellow pod colour (Table 4.1). We use 'G' for green. So, B matches I (G). C. Violet flower colour: Violet flower colour is dominant over white flower colour (Table 4.1). We use 'V' for violet. So, C matches IV (V). D. Round seed shape: Round seed shape (R) is dominant over wrinkled seed shape (r). So, D matches V (R). E. Yellow seed colour: Yellow seed colour (Y) is dominant over green seed colour (y). So, E matches II (Y). Therefore, the correct matching is: A-III, B-I, C-IV, D-V, E-II. Option D provides the correct match for all pairs. Option B is incorrect because A-I, B-III, C-II, D-IV, E-V are incorrect pairings. Option C is incorrect because B-II, D-I, E-V are incorrect pairings. Option A is incorrect because A-IV, C-III are incorrect pairings. The question evaluates the knowledge of specific dominant traits and their standard symbolic representation as established by Mendel.