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Chromosomeplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins. theory: the theory that genesplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-), the basic unit of inheritance, are located on chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins.. First demonstrated by Thomas Hunt Morgan in 1911 using Drosophilaplugin-autotooltip__default plugin-autotooltip_bigDrosophila melanogaster: a fruit fly species used in genetics research. and sex-linkedplugin-autotooltip__default plugin-autotooltip_bigSex linkage: a gene is said to be sex-linked if it maps to a sex chromosome. mutantsplugin-autotooltip__default plugin-autotooltip_bigMutant: an individual that has a different phenotype than wildtype and likely contains one more mutations that cause this difference..