1. the physical breakage and reunion of non-sister chromatids during prophase I ----------> crossing over 2. the region of a chromosome where sister chromatids remain attached ----------> centromere 3. chromatids in a bivalent that do not share a centromere ----------> non-sister chromatids 4. a four-stranded structure of homologous chromosomes in alignment ----------> bivalent 5. the microtubule organizing center ----> centrosome 6. paired chromosomes that share the same set of genes ----------> homologous chromosomes 7. cross-like structures found in bivalents as a consequence of crossing over ----------> chiasmata 8. alignment of homologous chromosomes during prophase I ----------> synapsis