BIOLOGY 152 Lecture : Evolution Chapter 12 Animal Radiation (Bio 152)
Document Summary
Radiations : rapid expansions of clades to give rise to many species. Adaptive radiations : rapid expansions of clades to give rise to many diverse species adapted to different ecological niches. Adaptive landscape : visualizations of how selection acts on lineage over time. Pre-adaptations : traits in a lineage that existed had prior to a transition that give that lineage some advantage in a new ecological niche. Exaptation :re-purposing of a pre-existing trait for a novel function. Opisthokont clade :a clade of eukaryotes characterized by a flagellum. Bilateral symmetry: trait of having a single plane of symmetry. Evolutional arms race: a cycle of measures and countermeasures between interacting lineages. Red queen principle: idea=population must keep adapting via ds because other species with which they interact are also constantly evolving. Tetrapod: a clade of vertebrates characterized by four limbs and lungs. Amniotes : a clade of tetrapod characterized by an egg can persist on dry land, complex lung, and protective skin.
