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Pair the entries from List-I with those in List-II appropriately: List-I: (A) XX-XO system (B) XX-XY system (C) Chromosome count: 45 (D) ZW-ZZ system List-II: (i) Turner syndrome (ii) Female heterogamety (iii) Grasshopper (iv) Male homogamety

1. (A)-(iv), (B)-(ii), (C)-(i), (D)-(iii)
2. (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
3. (A)-(i), (B)-(iv), (C)-(i), (D)-(iii)
4. (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

Correct answer: (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

Solution

The XX-XO method is found in grasshoppers (A-iii), the XX-XY method involves male homogametic sex determination (B-iv), karyotype 45 is associated with Turner’s syndrome (C-i), and the ZW-ZZ method involves female heterogametic sex determination (D-ii).

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