Genetic map: a map that shows geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) positions on chromosomesplugin-autotooltip__default plugin-autotooltip_bigChromosome: a structure that organizes dsDNA in a cell through interactions with various DNA binding proteins. measured in centiMorgansplugin-autotooltip__default plugin-autotooltip_bigMap unit (m.u.): a unit of genetic distance defined as 1% recombination. Also called a centiMorgan or cM..