Question

Genetic drift operates in :-

• A. Small isolated population
• B. Large isolated population
• C. Fast reproductive population
• D. Slow reproductive population

Answer 1

The Correct Option is A

Genetic drift is a mechanism of evolution that refers to random changes in the frequency of alleles in a gene pool, particularly in small, isolated populations. Here, we'll explain why genetic drift operates most effectively in a small isolated population and why other options are not correct:

1. Understanding Genetic Drift:

• Genetic drift occurs due to chance events that cause certain alleles to become more common in a population.
• It's more significant in smaller populations because random events can have a larger effect on such populations.
• In a small population, the loss or fixation of alleles can occur swiftly due to fewer individuals carrying that allele.

2. Explanation of Options:

1. Small isolated population:
   • Correct answer as genetic drift effects are most pronounced here.
   • In small populations, random changes are more likely to lead to significant changes in allele frequencies, potentially leading to evolution.
2. Large isolated population:
   • Incorrect because larger populations buffer against random changes, minimizing the effect of genetic drift.
   • In large populations, there are more individuals, making it less likely that chance alone will override other factors like natural selection.
3. Fast reproductive population:
   • Incorrect because the rate of reproduction does not directly influence the impact of genetic drift.
   • Even if the population reproduces quickly, the size of the population rather than the speed of reproduction affects genetic drift.
4. Slow reproductive population:
   • Incorrect as the slow rate of reproduction does not facilitate genetic drift in any specific way compared to population size.

Conclusion:

The small isolated population is where genetic drift operates most effectively due to their vulnerability to random events altering allele frequencies drastically. Therefore, the correct answer is Small isolated population.