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saul85 [17]
3 years ago
9

Why are genes sometimes expressed and sometimes not expressed

Biology
1 answer:
Ugo [173]3 years ago
5 0

Answer:

Each cell expresses, or turns on, only a fraction of its genes. The rest of the genes are repressed, or turned off. Signals from the environment or from other cells activate proteins called transcription factors. These proteins bind to regulatory regions of a gene and increase or decrease the level of transcription.

Explanation:

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