Match List I with List II
| List I | List II |
|---|---|
| A. Genetic drift | I. Change in allele frequency due to immigration and emigration |
| B. Stabilising selection | II. Change in gene frequency due to chance factor |
| C. Gene flow | III. More individuals acquire mean character value |
| D. Saltation | IV. Single step large mutation |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A - II, B - III, C - I, D - IV
(A) Genetic drift — this matches (II) Change in gene frequency due to chance factor. In a small population, allele frequencies can change by chance alone. When the change is large, it is called the founder effect.
(B) Stabilising selection — this matches (III) More individuals acquire mean character value. Selection removes the extremes, so more individuals come to have the average value of the character.
(C) Gene flow — this matches (I) Change in allele frequency due to immigration and emigration. When individuals move into or out of a population, they add or take away alleles.
(D) Saltation — this matches (IV) Single step large mutation. Hugo de Vries believed that mutations cause speciation in one large jump, which he called saltation.