Environmental conditions can influence gene
within a cell by activating molecules that regulate the
transcription or translation of genes. An organism's potential to vary its phenotype in response to environmental stimuli
is called
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Some environmental stimuli activate methylation, which affects the
and its
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accessibility to RNA polymerase and transcription factors. Sometimes, gene expression is simply a cell's response to
the presence or absence of gene products, such as
Environmental stressors can cause the release of
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that flow through the bloodstream and bind to regulatory regions of DNA. In embryonic
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development, local molecular signals called
activity of neighboring cells.