What situation in which the allele frequencies in a population do not change and the population does not evolve?

What situation in which the allele frequencies in a population do not change and the population does not evolve?
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That situation is called a Hardy-Weinberg equilibrium. Notactually seen outside of the lab.
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with suitable example tell me what is the difference between gene and allele -Biology

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A pair of contrasting characters controlling the same trait is called - (1) factors (2) loci (3) allele (4) lineage

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