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Structure od DNA
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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

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)

Slide 22

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 23

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 24

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 25

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Taylor and co-workers (1957)

3H-labelled chromosomes

after one further replication

in unlabelled media

Slide 26

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Meselson and Stahl (1958)

Slide 27

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 28

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

A replicating Drosophila chromosome

Slide 29

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Origins initiate replication at different times.

Slide 30

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 32

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

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AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

Slide 35

AS Biology. Gnetic control of protein structure and function

AS Biology. Gnetic control of protein structure and function

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