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Rooting the Tree<br />

A<br />

10<br />

d (A,D) = 10 + 3 + 5 = 18<br />

Midpoint = 18 / 2 = 9<br />

B<br />

2<br />

1) Midpoint rooting: Roots the tree at the midway point<br />

between the two most distant taxa in the tree, as<br />

determined by branch lengths. Assumes that the taxa are<br />

evolving in a clock-like manner. This is used mostly for<br />

the distance-based tree building methods.<br />

3<br />

2<br />

C<br />

5<br />

D

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