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Is similarity really<br />

interesting?<br />

<br />

<br />

Common ancestry is more<br />

interesting<br />

Makes it more likely that genes<br />

share the same function<br />

Homology: sharing a common<br />

ancestor<br />

– a binary property (yes/no)<br />

– It’s a nice tool:<br />

When (a known gene) G is<br />

homologous to (an unknown) X it<br />

means that we gain a lot of<br />

information on X<br />

X<br />

Z<br />

Y

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