Evolution Flashcards
Define ontogeny
Sequential expression within an individual in response to environments similar, though not necessarily identical to the original selecting criteria
Define evolution
Sequential consolidation of gene modifications that occur during ontogeny and subsequently survive successive exposure to selection criteria at the population level
Monophyletic group
Includes a hypothetical common ancestor, plus all of the defendant species
Paraphyletic group
Includes some but not all descendant species from one or more common ancestor
Apomorphies
Derived morphological traits that carry reliable information about phylogenetic relationships
Plesiomorphies
Primitive morphological traits inherited from common but distant and typically shared by many other species
Homology
Shared ancestry between a pair of structures/genes, in different species
Analogy
Similar structures arise from separate evolutionary origins
Homoplasy
Characteristic shared by a set of species but is not present in common ancestor
Craniates Apomorphies:
Cranium
Tripartite brain
Liver and kidney(s)
Heart with 2 or more chambers
Vertebrate Apomorphies:
Craniate apomorphies and…
Vertebrae
Two vertical semicircular canals