<P> Non-sister chromatids , on the other hand , refers to either of the two chromatids of paired homologous chromosomes , that is , the pairing of a paternal chromosome and a maternal chromosome . In chromosomal crossovers , non-sister ( homologous ) chromatids form chiasmata to exchange genetic material during the prophase I of meiosis ( See Homologous recombination ) . </P>
<P> Non-sister chromatids , on the other hand , refers to either of the two chromatids of paired homologous chromosomes , that is , the pairing of a paternal chromosome and a maternal chromosome . In chromosomal crossovers , non-sister ( homologous ) chromatids form chiasmata to exchange genetic material during the prophase I of meiosis ( See Homologous recombination ) . </P>
before prophase i chromatid arms in a chromosome are
before prophase i chromatid arms in a chromosome are
chiasmata
chiasmata