ɪn sᵻlˈɛktɪv swˈiːp, pˈɑːzᵻtˌɪv sᵻlˈɛkʃən kˈɔːzᵻz ðə nˈuː mjuːtˈeɪʃən tə ɹˈiːtʃ fɪksˈeɪʃən sˌoʊ kwˈɪkli ðæt lˈɪŋkt ɐlˈiːlz kˈæn "hˈɪtʃhaɪk" ænd ˈɔːlsoʊ bɪkˌʌm fˈɪkst.
In selective sweep, positive selection causes the new mutation to reach fixation so quickly that linked alleles can "hitchhike" and also become fixed.