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Chapter 23
"Systematics, Phyloginies, and Comparative Biology"Evolutionary Biology, BIOL152
Question | Answer |
---|---|
ancestral | similarity among species that is inherited from the most recent common ancestor of an entire group |
derived | similarity that arose more recently and is shared vy only a subset of the species |
taxa | species or higher level groups such as genera or families |
polarize | to determine whether particular character states are ancestral or derived |
outgroup | a soecies or group of species that is closely related to, but not a member of, the group under study |
cladogram | depicts a hypothesis of evolutionary relationships |
clade | species that share a common ancestor as indicated by shared derived characters |
synapomorphy | a derived character shared by clade members |
plesiomorphies | ancestral states |
symplesiomorphies | shared ancestral states |
homoplasy | a shared derived character state that has not been inherited from a common ancestor exhibiting that character state |
principle of parsimony | favors the system with less assumptions |
molecular clock | the rate of evolution of a molecule is constant through time |
classification | placing species in groups |
taxonomy | science of classifying living things |
monophyletic | includes the most recent common ancestor of the group and all of its decendants |
paraphyletic | includes the most recent common ancestor of the group but not all of its ancestors |
polyphyletic | does not include the most recent common ancestor of all the members of a group. |
Phylogenetic species concept (PSC) | the term species should be applied to groups of populations that have been evolving independantly of other groups of populations |
species richness | the number of species in a clade |
systematics |