Which is a process that eliminates harmful alleles from a gene pool?

A process that eliminates harmful alleles from a gene pool is negative selection.

Explanation:

When an allele is deleterious, it means that has negative consequences for the reproduction and survivor of an organism. When an individual has the deleterious allele, his chances of surviving decreased. After some time, individuals with no deleterious allele will predominate and finally that ones that has it, will dissapear. This process is called negative selection and involves that a deleterious allele will be selectively eliminated from a gene pool.

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