Differential gene expression is the process by which cells become different from one another based on the unique combination of genes that are active, or “expressed.”

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#Unit 4. Cell Communication and Cell Signaling

miR-15-a and miR-16-1, control the proliferation of 

B cells

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#Unit 8. Inheritance Biology

DOMINANT EPISTASIS

In dominant epistasis, however, only a single copy of an allele is required to inhibit the expression of an allele at a different locus.

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#Unit 2. Cellular Organization

Stimulation of b-galactosidase synthesis by cAMP with wild-type and mutant CAP.

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#Unit 4. Cell Communication and Cell Signaling

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#Unit 11. Evolution and Behavior

The Death of a Gene

When a gene is duplicated, the new copy is often dead-on arrival (lacks the regulatory elements).