How can Hardy-Weinberg equilibrium be affected ? Explain giving three reasons.

Explanation

**Step-by-Step Solution:**

1. **Understanding Hardy-Weinberg Equilibrium**: The Hardy-Weinberg equilibrium is a principle that describes the genetic variation in a population that is not evolving. It states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.

2. **Factors Affecting Hardy-Weinberg Equilibrium**: There are several factors that can disrupt this equilibrium. The question specifically asks for three reasons, so we will focus on three key factors: gene migration, genetic drift, and mutation.

3. **Gene Migration**:
- Gene migration, also known as gene flow, occurs when individuals from one population migrate to another population and breed. This can introduce new alleles into the gene pool of the receiving population, altering allele frequencies.
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