Match the items of column I with column II: Column I: (a) XX-XO method of sex determination (b) XX-XY method of sex determination (c) Karyotype-45 (d) ZW-ZZ method of sex determination Column II: (i) Turner's syndrome (ii) Female heterogametic (iii) Grasshopper (iv) Female homogametic Select the correct option from the following:
Answer: (C) a-iii, b-iv, c-i, d-ii. Answer: (C) a-iii, b-iv, c-i, d-ii Solution: XX-XO sex determination is seen in grasshopper (a-iii).
- A.a-ii, b-iv, c-i, d-iii
- B.a-i, b-iv, c-ii, d-iii
- C.a-iii, b-iv, c-i, d-ii✓
- D.a-iv, b-ii, c-i, d-iii
Correct Answer
(C) a-iii, b-iv, c-i, d-ii
Solution & Explanation
Answer: (C) a-iii, b-iv, c-i, d-ii Solution: XX-XO sex determination is seen in grasshopper (a-iii). In XX-XY type the female is homogametic, i.e., female homogamatic (b-iv). Karyotype 45 (45, X0) corresponds to Turner's syndrome (c-i). The ZW-ZZ method (as in birds) has female heterogametic (d-ii). Matching all gives a-iii, b-iv, c-i, d-ii. NCERT Reference: NCERT Class XII, Ch 4, p.70, lines 027-031: "Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes, whereas females have a pair of X-chromosomes."