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Sex chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins.: in some species, these are a set of chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins. that determine sex. In some species, females are homogametic (XX) and males are heterogametic (XY), whereas in other species it is the other way around (homogametic ZZ males and heterogametic ZW females). Not all species use sex chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins. for sex determination.