Key Terms:
Macro evolution- major changes over evolutionary time
Geological record-
adaptive radiation- a group of organisms forms new species, whose adaptations allow them to fill new habitats or roles in their communities
"evo-devo"- a field that combines evolutionary and developmental biology
Paedomorphic- retaining juvenile traits into adulthood
homeotic genes- are master control genes that determine basic features, such as where pairs of wings or legs develop on a fruit fly
phylogeny-evolutionary history of a species or group of species
convergent evolution- analogous similarities in similar environments
systematics- classifies organisms
phylogenetic tree-a hypothesis of evolutionary relationships within a group
molecular systematics-compares ncleic or other molecules to infer relatedness of taxa
molecular clocks- can be calibrated in real time by graphing the number of nucleotide diffferences against the dates of evolutionary branch points known from the fossil record
different genes evolve at different rates
evolution is not goal directed
natural selection results fromthe interactions between organism and their environment
if the environment changes, apparent evolutionary trends may cease or reverse
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