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What does a phylogeny show?
Evolutionary relationships, common ancestry, and speciation history
In a phylogeny, what does a node represent?
A speciation event (common ancestor splitting)
What does it mean if two species share a more recent node?
They are more closely related
Can rotating branches change a phylogeny’s meaning?
No
What is a polytomy?
A node with >2 branches (uncertain relationships)
What is a clade (monophyletic group)?
Ancestor + all descendants
Paraphyletic group?
Missing some descendants
Polyphyletic group?
No recent common ancestor
What is a species in binomial nomenclature?
The full two-part name (genus + specific epithet)
Are reptiles a clade?
No
Why aren’t amphibians and reptiles closest relatives?
Amniotes (reptiles + mammals) share a more recent common ancestor