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Housekeeping geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-): a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) that is always expressedplugin-autotooltip__default plugin-autotooltip_bigExpression: a term used to describe the idea that the function of a gene is apparent and can be observed. Genes may not always be expressed all the time in all places. in all cell types, usually that has some function that is universal to all cells. Housekeeping geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) tends to be used in the context of multicellular organisms; “constitutiveplugin-autotooltip__default plugin-autotooltip_bigConstitutive: a term describing a pattern of gene expression, wherein the gene is always expressed no matter what. For some genes, constitutive expression is normal (see housekeeping gene). For inducible genes or operons, constitutive is a mutant state.” tends to be used more for unicellular organisms.