When an allele increases in frequency because it is in close proximity on the chromosome to a positively selected allele, this causes

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This phenomenon is known as linkage disequilibrium, where alleles at different loci on the chromosome do not assort independently due to their physical proximity to each other. When an allele increases in frequency because it is close to a positively selected allele, it is hitchhiking on the success of that allele, not because of its own fitness benefits.

When an Allele Increases in Frequency Because It Is in Close