I had the same definition as you above. It is a bit confusing to me. They say the exchange of information between homologous chromosomes. I ruled out sister chromatids cause it should say "non-sister", then sex chromosomes seems not to fit entirely, chromatids might but it is not specific ito "non-sister" which leaves me with homologues. Homologues seems to related closest to homologous chromosomes, but I am still uncertain
