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AP Biology

Gene Expression and Regulation

Learn Gene Expression and Regulation in AP Biology from the production AIPH study guide.

Study guide topics

Cellular Structure and FunctionCellular Processes and EnergyGenetics and HeredityGene Expression and RegulationEvolution and Natural SelectionEcological Interactions and EcosystemsBiotechnology in Medicine and AgricultureConservation Biology and Environmental StewardshipGenetic Testing and Personalized MedicineMastering Free-Response QuestionsEffective Use of Diagrams and Models

Advanced Topics

In a nutshell: Gene regulation lets cells specialize and adapt, and is central to health and disease.

## Turning Genes On and Off Not all genes are active at all times. Cells control which genes are expressed, allowing them to adapt and specialize. ### How Gene Regulation Works - **Transcription Factors**: Proteins that turn genes on or off. - **Epigenetics**: Chemical modifications to DNA or histones that affect gene activity without changing the DNA sequence. ### Importance of Regulation Proper gene regulation ensures that cells develop correctly and function normally. Errors can lead to diseases like cancer. ### Modern Science - CRISPR technology allows scientists to edit genes, offering hope for treating genetic disorders. - Understanding epigenetics is leading to breakthroughs in cancer therapies.

Examples

  • Liver cells and nerve cells have the same DNA but express different genes.
  • Cancer can result from genes that fail to turn off cell division.

Key terms

Epigenetics
Study of heritable changes in gene expression that do not involve changes to the underlying DNA sequence.
Transcription Factor
A protein that controls the rate at which genetic information is transcribed.
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