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🧬 How does DNA copy itself?

The double helix opens and each strand templates a partner — replication with proofreading.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Copying the code of lifeExplain complementary base pairing and the replication fork toolkit.DNA opens and each strand templates a partner. Helicase and polymerases run the fork; leading and lagging strands differ by polarity.
Speed with proofreadingDescribe fidelity mechanisms, origins, and telomere end problems.Proofreading and repair protect sequence. Many origins speed eukaryotic copying. Telomeres manage linear ends.
When copies go wrongConnect errors to mutation and lab PCR to the same pairing logic.Unrepaired errors become mutations. PCR amplifies chosen DNA by cycling the same chemistry. Semiconservative inheritance keeps one old strand per duplex.

Questions this course answers

Why can one DNA strand specify the sequence of a new strand?

Complementary base pairing lets each template strand guide the order of new nucleotides.

Order key events at a replication fork

Unwind first, synthesize next, handle discontinuous lagging strand, then finish joins.

In your own words, what does semiconservative replication mean?

Parental strands separate and each is conserved in a new duplex paired with a new strand.

Grounded in trusted sources

Alberts Molecular Biology of the Cell — DNA replication chapters
NIH genetics education resources on DNA structure and replication
Meselson and Stahl experiment historical summaries (educational)
Standard genetics textbooks on proofreading, telomeres, and PCR

Every Wunder lesson is built from real, reputable sources — never invented.

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