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Sex linkage: a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) is said to be sex-linkedplugin-autotooltip__default plugin-autotooltip_bigLinkage: two loci are linked to each other if they are less than 50 m.u. apart. Two loci are unlinked if they are either (1) greater than 50 m.u. apart on the same chromosome, or; (2) are on separate chromosomes. if it maps to a sex chromosomeplugin-autotooltip__default plugin-autotooltip_bigSex chromosomes: in some species, these are a set of chromosomes 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.