Biology / Unit 6 Bio 1335 short lesson, about 20 seconds
Gene Expression Is Regulated, Not Automatic
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The idea
A gene's presence in DNA does not guarantee its expression, since regulation at several levels can leave it silent.
In practice
Every cell in a human body carries the same genes, yet a liver cell and a neuron express largely different sets.
Where people slip
Detecting a gene in genomic sequencing does not mean its protein appears in every tissue — expression, not detection, decides that.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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