Cells with the same DNA can look and function differently from each other; consider a photoreceptor cell and muscle cell. The difference between these two cells is the result of differential gene expression. Some genes are transcribed and translated in all cells at about the same level, but other genes may be expressed in one cell type but not another. This session will briefly outline some general principles of gene regulation. In addition, a specific example of gene regulation in bacteria will be presented in detail.
For this session, watch the first 30 minutes of the video lecture called “Gene Regulation” by Prof. Eric Lander recorded in 2004.
What is the function of the protein encoded by the LacZ gene?
When should E. coli produce beta-galactosidase?
Help Session Video
Watch the short video of Sera Thornton explaining the lac operon.
Suggested topics for further study in an introductory-level Biology textbook
- The Lac operon
- Gene regulation