Gene expression and regulation

What you'll learn

1. 1

   Imagine your DNA is like a giant cookbook full of recipes (genes). Your cells only cook the recipes they need right now.

2. 2

   What does gene expression mean?

3. 3

   Drag the transcription factor to the gene's 'start' switch (promoter) to turn the gene ON.

4. 4

   Let's walk through how a skin cell makes melanin (pigment) using gene expression.

5. 5

   What molecule reads the gene to make an mRNA copy?

6. 6

   Now you're the cell! Tap the correct step to turn OFF the melanin gene when there's no UV light.

7. 7

   What happens to a gene when no transcription factor binds to its promoter?