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fossil record
Any preserved evidence of an organism
geologic time scale
record of earth history
radiometric dating
using the decay of radioactive isotopes to measure the age of rock
relative dating
method used to date age of rocks by comparing them wit other layers
allopatric speciation
physical barrier divides one population into two or more populations
anolous structure
structurs that has the same funtional structurs in other organisms
ancestral trait
newly evolved featured that you find in fossiles
artificial selection
darwins trem for the selective breeding of organism selected for certain traits in order to produce off spring with traits.
derived trait
newly evoled features not showen in fossils
directional selection
shift of a population towards extreme version of a benefical trait
disruptived selection
spilts a population in two groups. getting ride of the mean
evolution
hereditary change in groups of living organisms over time
fitness
measure of the relative contribution an individual trait makes to the next generation
founder effect
occers when a small sample of population settles in a location separate from the rest of the population
genetic drift
changing the allelis frequency in population
gradualism
theory that evolution occers in small gradual steps over time
homologous structure
anatomically similar structures inherited from a common ancestor
natural selection
theory of evolution developed by darwin based on 4 idea.
punctuated equilibrium
theory that evolution occers within relativety sudden peorides of specation followed by long period of stability
sexual selection
change in frequence of a trait os based on the ability to atract a mate
stabilizing selection
most common form of natural selection in which organism with extrem expresion of trait are removed.
sympatric speciation
speice evolv into other specis without a physical barrier
vestigal structure
reduced or uneeded form of a funtional structure in other organism
Author
aero
ID
154064
Card Set
Scince terms to know
Description
idk
Updated
2012-05-16T02:49:31Z
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