Fluctuation of Gene Frequency in Small Populations
Random fluctuation in gene frequency in small population is known as-
- Genetic drift — Correct Answer
- Genetic load
- genetic death
- None
Explanation:
Correct Answer: Genetic drift
Genetic drift (also called Random Genetic Drift or Sewall Wright effect) is defined as the random fluctuation of allele frequencies from one generation to the next due to chance sampling of gametes. The effect is large and consequential specifically in small populations.
Genetic Drift — Key Properties
| Property | Detail |
|---|---|
| Alternative name | Sewall Wright effect |
| Type of force | Dispersive (not systemic) |
| Population | Only significant in small populations |
| Predictability | Amount predictable; direction NOT predictable |
| Long-term effect | Random fixation (p→1) or elimination (p→0) of alleles |
Why Other Options Are Wrong
- Genetic load: Accumulation of deleterious alleles in a population — related to selection and mutation, not random fluctuation.
- Genetic death: Death of an individual without reproducing due to a lethal genotype — refers to selection, not random frequency changes.
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
