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This video is licensed under a Creative Commons Attribution- Share Alike 3.0 Unported license. Useful Genetics Professor Rosie Redfield The University of British Columbia

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Useful Genetics Professor Rosie Redfield The University of British Columbia. This video is licensed under a Creative Commons Attribution-Share Alike 3.0 Unported license. Lecture 1D. The history of DNA. ??. Outline:. DNA replication The Cell Theory in biology - PowerPoint PPT Presentation

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Page 1: This video is licensed under a Creative Commons Attribution-Share Alike 3.0 Unported license

This video is licensed under a Creative Commons Attribution-Share Alike 3.0 Unported license.

Useful GeneticsProfessor Rosie Redfield

The University of British Columbia

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2

• Describe DNA replication• Explain the role of DNA replication

in the history of DNA

The history of DNA

a) DNA replication

b) The Cell Theory in biology

c) A ‘DNA Theory’ for genetic information

d) DNA’s evolutionary continuity

Lecture 1D

Outline:

Learning objectives:

??

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3

DNA replication

Image from Wikimedia Commons

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4

DNA replication

Image from Wikimedia Commons

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5

DNA replication

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6

Evolutionary continuity of life

Eukaryotes

Bacteria

Archaea

Most recent common ancestor of all life

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7

The Cell Theory in biology

Omnis cellula e cellula

"Every cell originates from another existing cell like it, by cell division.”

Virchow’s cell drawings from Wikimedia Commons

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8

Evolutionary continuity of life

Eukaryotes

Bacteria

Archaea

Most recent common ancestor of all life

cells

cells

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9

The DNA Theory

Omnis DNA e DNA

"Every DNA strand originates from a preexisting complementary DNA strand, by DNA replication.”

DNA sketch from Wikimedia Commons

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10

Evolutionary continuity of life

Eukaryotes

Bacteria

Archaea

Most recent common ancestor of all life

DNA

DNA

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11

What we’ve done

a) DNA replication• Each strand is the template for

a new strand• Each new dsDNA has one old

strand and one new strand

b) DNA’s evolutionary continuity• like cells, all DNA is copied

from existing DNA

• All DNAs are descended in a lineage from the first DNA.

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12

Coming up....

What makes a DNA sequence a gene?

Lecture 1E

?

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