Fraction of Alleles at a Given Locus
__________ is the fraction of all the alleles that occur at a given locus in a specified population.
- Genotypic frequency
- Gene frequency — Correct Answer
- Phenotypic frequency
- Mutation rate
Explanation:
Correct Answer: Gene frequency
Gene frequency (allele frequency) is the relative proportion of a particular allele among all allele copies at a specific locus in a given population. It is fundamental to population genetics.
Hardy-Weinberg Equilibrium — Key Formulae
| Index | Gene A | Gene a |
|---|---|---|
| Gene frequency | p | q |
| Important relation | p + q = 1 | |
| Genotype | AA | Aa | aa |
|---|---|---|---|
| Frequency | P = p² | H = 2pq | Q = q² |
| Relation | P + H + Q = 1 | ||
Notes on H-W Equilibrium
- Gene frequency of A: p = P + ½H; Gene frequency of a: q = Q + ½H
- Frequency of heterozygotes (2pq) cannot exceed 50%; maximum is when p = q = 0.5
- Forces disturbing H-W equilibrium: Mutation, Migration, Selection (systemic); Random Genetic Drift (dispersive)
📚 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.
