ANTH 4040 Chapter : BROPHY - Chapter 4
Document Summary
Anagenesis the gradual accumulation of changes in ancestor-descendant lineages through time linear: difficult to measure when exactly those changes occurred based off of fossils. Cladogenesis the formation of one or more new species from another over time: adaptive radiation, non-linear/branching the parent population continues to exist after other species have branched off from it. Adaptive radiation a process that takes place when a life form rapidly takes advantage of the many newly available ecological niches: e. g. Darwin"s finches: a species or group of species will diverge into as many variations as two factors allow, its adaptive potential, the adaptive opportunities of the available niches. Micro vs. macro evolution: micro small scale changes that occur within a species over time; not a speciation event, example: blood type changes, macro changes that cause a speciation event. Why do they get maintained: sometimes beneficial (example: peppered moths, neutral, recessive or hidden.
