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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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• 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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DNA replication
Image from Wikimedia Commons
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DNA replication
Image from Wikimedia Commons
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DNA replication
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Evolutionary continuity of life
Eukaryotes
Bacteria
Archaea
Most recent common ancestor of all life
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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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Evolutionary continuity of life
Eukaryotes
Bacteria
Archaea
Most recent common ancestor of all life
cells
cells
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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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Evolutionary continuity of life
Eukaryotes
Bacteria
Archaea
Most recent common ancestor of all life
DNA
DNA
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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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Coming up....
What makes a DNA sequence a gene?
Lecture 1E
?
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