Biology / Unit 6 Bio 1249 short lesson, about 20 seconds
The Genetic Code's Triplet Codons
Captions available
The idea
The genetic code reads mRNA in three-nucleotide units called codons, and each of the 64 codons specifies one amino acid or a stop signal.
In practice
The codon sequence AUG-GGC-UAA specifies methionine, then glycine, then a stop signal, read three bases at a time.
Where people slip
A codon is three nucleotides — shifting the reading frame by even one base changes every codon that follows it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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