Understanding DNA Sequence and Errors

"How DNA’s Sequence Is Set — and What Happens When It Goes Wrong" 🎙️ Narrator (friendly,

clear tone): Every living thing — from bacteria to blue whales — is built using the

same four letters: A, T, C, and G.

These letters stand for the bases Adenine, Thymine, Cytosine, and Guanine,

the building blocks of DNA. 🧬 Part 1: How the Sequence Gets Set 🎙️ Narrator:

When a cell divides, it must copy its DNA perfectly — like making an exact duplicate of a giant

instruction manual. This process happens through DNA replication. The two strands of the DNA molecule

unzip, and each strand becomes a template for building a new complementary strand.