Structure od DNA

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3

Property 3 - it must be capable of some variation (mutation) to permit evolution

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AS Biology. Gnetic control of protein structure and function

Replication of DNA and Chromosomes

Speed of DNA replication: 3,000 nucleotides/min in human 30,000 nucleotides/min in E.coli

Accuracy of DNA replication: Very precise (1 error/1,000,000,000 nt)

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

Taylor and co-workers (1957)

3H-labelled chromosomes

after one further replication

in unlabelled media

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AS Biology. Gnetic control of protein structure and function

Meselson and Stahl (1958)

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

A replicating Drosophila chromosome

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AS Biology. Gnetic control of protein structure and function

Origins initiate replication at different times.

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function