Lectures 5&6-Systematics Flashcards
Phylogenies are shown as trees of ____?
Relatedness.
Define homology
Similar features due to shared ancestry
Define Analogy
Similar features due to convergent evolution but do not share recent common ancestor.
What is convergent evolution?
Analogous characteristics can confound interpretations of similarities and can mask true relatedness.
Define homologous characteristic
Derived from common ancestor
Define analogous characteristic
Derived independently
Define monophyletic
A group of organisms descended from a common evolutionary ancestor or group. Especially one not shared with any other group.
Define paraphyletic
A group of organisms descended from a common evolutionary ancestor or ancestral group, but not including all the descendant groups.
Define polyphyletic
A group of organisms derived from more than one common evolutionary ancestor or ancestral group and therefore not suitable for placing in the same taxon.
