Final answer:
High linkage disequilibrium between different sites of the selected site is a characteristic feature of positive selection during a selective sweep. It occurs as new favorable alleles rapidly increase in frequency with little time for recombination, causing these alleles to be inherited together.
Step-by-step explanation:
A characteristic feature of positive selection in genetics during a selective sweep is a. High linkage disequilibrium between different sites of the selected site. During a selective sweep, a new favorable allele increases in frequency within a population so rapidly that there is little time for recombination to occur. This results in a high degree of linkage disequilibrium as the selected allele and its neighboring alleles on the chromosome are inherited together.
In contrast, elevated levels of recombination would decrease linkage disequilibrium, and positive selection can affect more than just the polymorphisms within the selected site. It's important to note that high linkage disequilibrium can lead to the reduction of genetic variance around the selected allele, because alleles close to the beneficially selected site also increase in frequency, a phenomenon known as 'hitchhiking.'