Class Notes 2: DNA Replication. Replication Process.

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Presentation transcript:

Class Notes 2: DNA Replication

Replication Process

I. Why does DNA replicate? A. Every new cell needs its own DNA. B. Must be identical to original. C. Occurs during interphase, before mitosis.

II. Replication A. Step 1- The hydrogen bonds holding the base pairs together are broken and the DNA unzips into 2 separate single strands.

B. Step 2 of Replication As the DNA is unzipping, each strand becomes a template. As the DNA is unzipping, each strand becomes a template. Free nucleotides from the cell match with the corresponding base pair. They are bonded by DNA polymerase. Free nucleotides from the cell match with the corresponding base pair. They are bonded by DNA polymerase.

C. Step 3 of Replication Replication produces 2 new single strands, each connected to one original strand. Replication produces 2 new single strands, each connected to one original strand. Since one strand is “conserved” in each new molecule of DNA, this is called semi-conservative replication Since one strand is “conserved” in each new molecule of DNA, this is called semi-conservative replication

Summary List the steps of replication. Why is replication necessary?