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How to draw a phylogenetic tree In this example, there are six beetle-like organisms, labelled A to F. A B C D E F A table has been completed, listing the features of each organism: Feature Body shape Colour Head colour Antennae present? Jaws visible? Spots on back? Colour of spots A Oval Yellow White No Yes Yes Black B Oval Yellow Black No Yes Yes Black C Round Orange Black No Yes Yes Black D Oval Pink White Yes No No None E Round Pink Black Yes No No None F Round Orange Black No Yes Yes White Using the records from the first table, a data matrix, recording the number of differences between pairs of organisms, has also been produced: Currently living (extant) organisms will be placed at the top of the tree — all of the organisms analysed live in the present. Coming down the tree, we are moving into the past. The last common ancestor of the organisms will be shown on the very bottom of the tree. B C D E F A 1 3 5 7 4 B 2 6 6 3 C 7 5 1 D 2 7 E 5 A B C F D E Last common ancestor

          How to draw a phylogenetic tree
In this example, there are six beetle-like organisms, labelled A to F.
A B C D E F
A table has been completed, listing the features of each organism:
Feature Body shape Colour Head colour Antennae present? Jaws visible? Spots on back? Colour of spots
A Oval Yellow White No Yes Yes Black
B Oval Yellow Black No Yes Yes Black
C Round Orange Black No Yes Yes Black
D Oval Pink White Yes No No None
E Round Pink Black Yes No No None
F Round Orange Black No Yes Yes White
Using the records from the first table, a data matrix, recording the number of differences between pairs of organisms, has also been produced:
Currently living (extant) organisms will be placed at the top of the tree — all of the organisms analysed live in the present.
Coming down the tree, we are moving into the past. The last common ancestor of the organisms will be shown on the very bottom of the tree.
B C D E F
A 1 3 5 7 4
B 2 6 6 3
C 7 5 1
D 2 7
E 5
A B C F D E
Last common ancestor

How to draw a phylogenetic tree
In this example, there are six beetle-like organisms, labelled A to F.
A B C D E F
A table has been completed, listing the features of each organism:
Feature Body shape Colour Head colour Antennae present? Jaws visible? Spots on back? Colour of spots
A Oval Yellow White No Yes Yes Black
B Oval Yellow Black No Yes Yes Black
C Round Orange Black No Yes Yes Black
D Oval Pink White Yes No No None
E Round Pink Black Yes No No None
F Round Orange Black No Yes Yes White
Using the records from the first table, a data matrix, recording the number of differences between pairs of organisms, has also been produced:
Currently living (extant) organisms will be placed at the top of the tree — all of the organisms analysed live in the present.
Coming down the tree, we are moving into the past. The last common ancestor of the organisms will be shown on the very bottom of the tree.
B C D E F
A 1 3 5 7 4
B 2 6 6 3
C 7 5 1
D 2 7
E 5
A B C F D E
Last common ancestor

Added by Tammy G.

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