Non-sister chromatidsplugin-autotooltip__default plugin-autotooltip_bigSister chromatids: a pair of chromosome-like structures that contain two identical dsDNA molecules that are the result of DNA replication.: Chromatidsplugin-autotooltip__default plugin-autotooltip_bigChromatid: a chromosome-like structure, two of which are formed after replication of a chromosome in both mitosis and meiosis. that are derived from two different chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins. in a homologous chromosomeplugin-autotooltip__default plugin-autotooltip_bigHomologous chromosomes: highly similar but non-identical chromosomes that are the same size and contain the same genes. pair during meiosis Iplugin-autotooltip__default plugin-autotooltip_bigMeiosis I: the first cell division of meiosis. Crossing over occurs during Meiosis I.. See also: sister chromatidsplugin-autotooltip__default plugin-autotooltip_bigSister chromatids: a pair of chromosome-like structures that contain two identical dsDNA molecules that are the result of DNA replication..