Discussion
Match an item in List-I with an item in
List-II. Use the code given below:
| List-I | List-II |
|---|---|
| a. Hb S | i. Micro evolutionary force |
| b. Hb E | ii. Africa |
| c. Thalasaemia | iii. S.E. Asia |
| d. Migration | iv. Greece |
Codes : a b c d
Answer: D
The correct matches are a-ii, b-iii, c-iv, d-i. Haemoglobin S (sickle cell) is common in Africa; Hb E is common in South-East Asia; thalassaemia is found around the Mediterranean, including Greece; migration is a microevolutionary force, together with mutation, selection, drift and gene flow. The code is ii iii iv i, option D.
Options A, B and C pair Hb S with the force or with Greece, or put Hb E in Africa.
Sickle cell, Hb E and thalassaemia are balanced polymorphisms linked to malaria resistance, so each is common where malaria was or is common, and that is why they are tied to regions in the list.
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