Definition of Gene Frequency
Which of the following is defined as the fraction of all the alleles that occur at a given locus in a specified population?
- Genotypic frequency
- Phenotypic frequency
- Gene frequency — Correct Answer
- Allelic diversity
Explanation:
Correct Answer: Gene frequency
Gene frequency (allele frequency) is the fraction of all the alleles that occur at a given locus in a specified population. It represents how common a particular allele is in a population.
Hardy-Weinberg Relationships
| Parameter | Symbol | Formula |
|---|---|---|
| Gene frequency of A | p | p = P + ½H |
| Gene frequency of a | q | q = Q + ½H |
| Genotypic freq. of AA | P | P = p² |
| Genotypic freq. of Aa | H | H = 2pq |
| Genotypic freq. of aa | Q | Q = q² |
Key rule: p + q = 1 and P + H + Q = 1. The frequency of heterozygotes (2pq) is maximum when p = q = 0.5, giving 2pq = 0.50 (50%).
📚 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.
