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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

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Presentation Transcript
slide1

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.

slide2

Lecture 1D

  • The history of DNA

??

Outline:

DNA replication

The Cell Theory in biology

A ‘DNA Theory’ for genetic information

DNA’s evolutionary continuity

Learning objectives:

  • Describe DNA replication
  • Explain the role of DNA replication in the history of DNA
dna replication
DNA replication

Image from Wikimedia Commons

dna replication1
DNA replication

Image from Wikimedia Commons

slide6

Evolutionary continuity of life

Archaea

Bacteria

Eukaryotes

Most recent common ancestor

of all life

slide7

The Cell Theory in biology

Omnis cellulaecellula

"Every cell originates from another existing cell like it,

by cell division.”

Virchow’s cell drawings from Wikimedia Commons

slide8

Evolutionary continuity of life

cells

Archaea

Bacteria

Eukaryotes

Most recent common ancestor

of all life

cells

slide9

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

slide10

Evolutionary continuity of life

DNA

Archaea

Bacteria

Eukaryotes

Most recent common ancestor

of all life

DNA

slide11

What we’ve done

  • DNA replication
    • Each strand is the template for a new strand
    • Each new dsDNA has one old strand and one new strand
  • DNA’s evolutionary continuity
    • like cells, all DNA is copied from existing DNA
    • All DNAs are descended in a lineage from the first DNA.
coming up

?

Coming up....

Lecture 1E

  • What makes a DNA sequence a gene?