Allele frequency: refers to how frequently a particular allele appears in a population.
Factors affecting are as follows:
1. Mutation- it adds new genes and alleles in a gene pool. It creates and maintains variation within a population.
2. Genetic drift- it is a random change in frequency of alleles occurring due to chance fluctuation. It effects small population
3. Natural selection- it is process by which better-adapted individuals are favoured by nature from a heterogenous population of less adapted individuals.
4. Gene flow- it is the movement of gene or allele from a population changing gene frequency when migration of a section of the population occurs to another place.
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