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Genetics: Gene Expression - Genes And Noncoding Dna, Flow Of Genetic Information, Control Of Gene Expression, Gene Expression And Aging

Medicine EncyclopediaAging Healthy - Part 2

Genomes contain all the genetic information needed by an organism, regardless of the circumstance or environment. Generally, however, even single-cell organisms use only a fraction of their genome at any time; that is, cells generally express only a fraction of their genome at any given time. This is especially true among the individual cells that make up multicellular organisms, where cell specialization (differentiation) dictates that only certain genes be expressed in certain cells, and only at particular times during the organism's life span.

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