You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/...

In this video, we look at phylogeny and phylogenetic trees. First we explore what is meant by phylogeny. We then look at how to interpret a phylogenetic tree, including what is meant by a node and sister groups. Finally, we look at the benefits of phylogeny over taxonomic classification.

Image credits:

Clownfish
https://commons.wikimedia.org/wiki/Fi...
Nick Hobgood, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Geranium
https://commons.wikimedia.org/wiki/Fi...
Dominicus Johannes Bergsma, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Bacillus cereus
https://commons.wikimedia.org/wiki/Fi...
Mogana Das Murtey and Patchamuthu Ramasamy, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Fungi
https://commons.wikimedia.org/wiki/Fi...
Fungi, Belfast by Albert Bridge, CC BYSA 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Amoeba
https://commons.wikimedia.org/wiki/Fi...
Dalinda Bouraoui CC BYSA 3.0 https://creativecommons.org/licenses/... , via Wikimedia Commons

Golden Hamster
https://commons.wikimedia.org/wiki/Fi...
Adamjennison111 at English Wikipedia, CC BYSA 3.0 http://creativecommons.org/licenses/b..., via Wikimedia Commons

Chinese hamster
https://commons.wikimedia.org/wiki/Fi...
Tristanspotter, Public domain, via Wikimedia Commons

Prairie vole
https://commons.wikimedia.org/wiki/Fi...
United States National Park Service, Public domain, via Wikimedia Commons

DiGangi Deermouse (prairie deer mouse)
https://commons.wikimedia.org/wiki/Fi...
6th Happiness, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Brown Rat
https://commons.wikimedia.org/wiki/Fi...
Dunpharlain, CC BYSA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

House mouse
https://commons.wikimedia.org/wiki/Fi...
Unknown authorUnknown author (original) / Ilmari Karonen (editing), Public domain, via Wikimedia Commons

Phylogenetic tree of rodentia (modified)
https://commons.wikimedia.org/wiki/Fi...
M ralser, CC BYSA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Vulpes vulpes
https://commons.wikimedia.org/wiki/Fi...
Joanne Redwood, CC0, via Wikimedia Commons

Border terrier
https://commons.wikimedia.org/wiki/Fi...
Petteri Sulonen from Helsinki, Finland, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Grey wolf
https://commons.wikimedia.org/wiki/Fi...
User:Mas3cf, CC BYSA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons


Anthemis April 2009
https://commons.wikimedia.org/wiki/Fi...
Alvesgaspar, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Glebionis February 2008
https://commons.wikimedia.org/wiki/Fi...
Alvesgaspar, CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Cichorium intybus alvesgaspar1
https://commons.wikimedia.org/wiki/Fi...
Alvesgaspar, CC BYSA 3.0 http://creativecommons.org/licenses/b..., via Wikimedia Commons