dˈʊɹɹɪŋ meɪˈoʊsɪs dˈʌbəlstɹˈænd bɹˈeɪks dˌiːˌɛsbˌiːˈɛs ðæt fˈɔːɹm wɪðˌɪn sˈʌtʃ pˌɑːlɪmˈoːɹfɪk ɹˈiːdʒənz mˈʌst biː ɹᵻpˈɛɹd baɪ ˌɪntɚsˈɪstɚ kɹˈoʊmɐtˌɪd ɛkstʃˈeɪndʒ, ɹˈæðɚ ðɐn baɪ ˌɪntɚhˈɑːməlˌɑːɡ ɛkstʃˈeɪndʒ.
During meiosis double-strand breaks (DSBs) that form within such polymorphic regions must be repaired by inter-sister chromatid exchange, rather than by inter-homolog exchange.