The genetic code & codon table (article) | Khan Academy
Learn how codons are groups of three nucleotides in mRNA that specify amino acids or stop signals in proteins. See the universal genetic code table and how reading frame determines the order of codons.

AI for Teachers - Khan Academy
Discover how the genetic code is translated into proteins by the cell machinery. Learn the roles of mRNA, tRNA, and ribosomes in protein synthesis.

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The genetic code (article) | Translation | Khan Academy
Learn about how the information in an mRNA sequence is decoded to make a polypeptide.

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The genetic code - Khan Academy
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Nucleic acids - Khan Academy
There's growing evidence that miRNAs and other small, non-coding RNAs are involved in certain human diseases, including some genetic diseases and cancers. In addition, researchers are developing artificial microRNAs as therapeutic tools to treat human diseases 2 ‍ .

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An in-depth looks at how transcription works. Initiation (promoters), elongation, and termination.

Sources of genetic variation (video) | Khan Academy
Although DNA replication is tightly regulated and remarkably accurate, errors do occur and result in mutations, which are also a source of genetic variation. Environmental factors can also cause mutations in genes, and viable mutations are inherited.