Chapter 264 F eature I nvestigation Background Scientists had been studying relationships between living species Found they could take DNA from extinct species and compare it to living species ID: 478875
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Slide1
By Maria Waterhouse
Chapter 26.4:
F
eature
I
nvestigationSlide2
Background
Scientists had been studying
relationships between living
species
Found they could take DNA from extinct species and compare it to living species
Alan Cooper,
Cécile
Mourer-Chauviré
, Geoffrey Chambers, Arndt von
Haeseler
, Allan Wilson, and
Svante
Pääbo
Compared the DNA from extinct flightless birds to birds alive today, and hypothesized a new
phylogentic
treeSlide3
Experiment
Decided to study relationships between the DNA of flightless birds
Type of discovery-based science.
Used to be many species of kiwis and
moas
in New Zealand
Some species of kiwis still exist, but
moas
are extinct.
Researchers extracted DNA from different flightless bird species
4 extinct species of
moas
and3 species of kiwis (New Zealand)
Emu
and cassowary
(Australia and New Guinea)
Ostrich (Africa and formerly Asia)
Rheas (South America)Slide4
Procedure
Samples were subject to PCR of the mitochondrial SSU
rRNA
gene. Compared continuous regions of the SSU
rRNA
gene from the species.
Lines of the
data show the DNA sequences of each bird
First line, DNA from one of the four extinct moa species. Then the other species that were analyzed. Slide5Slide6
Results
Dot is placed when they’re identical.
Changed
nucleotides are shown
Sometimes longer
sequence in between,
so they place a dashSlide7
Interpretations
These flightless birds had very similar DNA
Kiwi is more similar to African and Australian flightless birds than the
moas
Proposed that New Zealand was colonized twice by ancestors of flightless birds.
Proposed new
phylogentic
treeSlide8
New
Phylogentic
Tree