Evolution

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Key terms used when studying Evolution
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Socioecology studying how the social system evolves in response to ecological conditions how social & physical environment affects behaviour
Behavioural Ecology studying the relationship of distribution, morphology, behaviour and social organisation of habitats
Analogous Features similar features that evolved independantly but have similar functions and therefore similar structures similarity based on function e.g. bird's wing + bat's wing
Homologous Features similarity based on ancestry similar features that evolved from common ancestry and therefore share similar structure e.g. bird's wing + human hand bones
Vestigial Features genetically determined structures that have lost their ancestral function but are still retained through evolution e.g. human appendix
Atavistic Features the return or partial return of features that were common in ancestors e.g. modern horses with extra toes
Cladogenesis evolutionary splitting where a parent species splits into two distinct species
Anagenesis evolution of species involving change in a lineage over time without speciation
Convergent Evolution separate lineages that were quite different but became similar due to similar lifestyles
Homoplasy when ancestrally unrelated structures look alike e.g. leaf insect + leaf
Phylogenetic constraint 'basic body plan' of a species which cannot be altered by evolution can be modified but never completely changed
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