Index / Human Anatomy / DNA · Double Helix
Human Anatomy
DNA · Double Helix
The molecule of inheritance
A 2-metre coiled polymer inside every cell. Four letters — A, T, G, C — paired along a sugar-phosphate backbone encode the instructions for building and running a human.
Key specifications
Length/cell
~2 m
Base pairs
~3 billion
Chromosomes
46
Genes
~20,000
Sheet 007 · Plate 1 of 1 · 1:1 infographic
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