Q.How did the discovery of reverse transcriptase in retroviruses extend the original Central Dogma, and why is this still considered consistent with its core principle?

Step 1. Certain RNA viruses called retroviruses (e.g. HIV) carry the enzyme reverse transcriptase, which synthesises a DNA copy using the virus's own RNA genome as template.

Step 2. This RNA-to-DNA flow of information was not part of the Central Dogma's original, simplest DNA→RNA→protein statement.

Step 3. However, the deeper principle the Central Dogma expresses is that information can move among the various forms of NUCLEIC ACID (DNA to RNA, or RNA to DNA), but a protein's amino-acid sequence is never itself used as a template to reconstruct a nucleic-acid sequence. …

Separate the SIMPLEST statement of the dogma (DNA→RNA→protein only) from its DEEPER principle (information never flows out of prot …

• Claiming reverse transcriptase disproves the Central Dogma entirely — it only extends the simplest version; the …