EXPLORE THE CODE OF LIFE · INTERACTIVE BIOLOGY

Small changes.
Extraordinary consequences.

Twist a DNA double helix in 3D. Copy its strands, follow a gene into a protein, watch chromosomes divide and predict inheritance—all by changing something yourself.

BIOLOGY · CLASSES 11–12CBSE / NCERT · TELANGANA INTERMEDIATEFREE · NO ACCOUNT NEEDED

01 · DNA STRUCTURE

Inside the double helix

Rotate to see how complementary bases connect.

Drag to rotate · Tap a base pair

Teaching visualization, not a molecular-dynamics or real DNA-sequencing instrument. Distances and rates are schematic.

LOOK INSIDE DNA

Two strands. One code.

DNA is directional. The two sugar–phosphate backbones run in opposite directions; A pairs with T, and C with G.

Selected base pairA – T

Pair

Coding strand5′ → 3′

Template strand3′ → 5′

This is a short illustrative gene fragment. It does not represent a complete chromosome or gene with introns.

MY SCIENCE NOTEBOOK

Keep an observation, not a score.

After changing a model, write what changed and why. Notes stay only in this browser and can be deleted.

My observation / explanation

CONNECT THE IDEAS

Replication preserves information

Complementary strands allow a DNA sequence to be copied before cells divide.

Gene expression uses information

Transcription makes RNA; translation reads codons to assemble amino acids.

Meiosis redistributes information

Homologs and chromatids separate, while recombination and assortment generate variation.