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DNA: Life’s Instruction Manual
DNA stores hereditary information in a chemical code that cells read, copy, and edit.
Updated: 2026
Key ideas
Code to function
Genes are templates for RNAs and proteins that build and regulate cells.
Replication with proofreading
Cells copy DNA with high fidelity and repair many errors.
Variation enables adaptation
Mutations, recombination, and regulation differences drive diversity.
Mental model
- DNA is transcribed into RNA.
- RNA is translated into proteins (or acts directly).
- Proteins and regulatory RNAs shape cellular behavior.
FAQ
Is one gene equal to one trait?
Rarely. Most traits involve many genes plus environment.
Why do identical twins differ over time?
Epigenetics and life experience change gene expression.
What changed recently?
Sequencing became cheap, enabling precision medicine and ancestry analysis.