Gene Expression
The genetic content of each somatic cell in an organism is the same, but not all genes are expressed in every cell. The control of which genes are expressed dictates whether a cell is (a) an eye cell or (b) a liver cell. It is the differential gene expression patterns that arise in different cells that give rise to (c) a complete organism.
Source
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"OpenStax College, Introduction. October 16, 2013."
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OpenStax CNX
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