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the evolutionary process by which favorable traits that are heritable become more common in successive generations
the philosophy of science that believes that the natural processes operating now are doing so at the same rate as in the past
anatomical structures of organisms in a species which have lost much or all of their original function due to evolution
the collection of people or organisms of a particular species living in a given geographic area or space
a relationship between the frequencies of alleles and the genotype of a population
an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing
establishing a population by a small number of individuals, carrying only a small fraction of the original population's genetic variation
a type of natural selection in which genetic diversity decreases as the population stabilises on a particular trait value
when natural selection favors a single allele and therefore, allele frequency continuously shifts in one direction
diversifying (disruptive) selection
a type of evolution that simultaneously favors at both extremes of the distribution
the systematic difference inbetween individuals of different sexes in the same species
the occurrence of small-scale changes in allele frequencies in a population over a few generations
recognition species concept
a concept that defines a species as a set of organisms that recognise each other as potential mates
ecological species concept
defines a species as a set of organisms that are adapted to a particular set of resources
evolutionary species concept
a species is a lineage evolving separately from others and with its own unitary evolutionary role and tendencies
when populations physically separated by an extrinsic barrier evolve so that if the barrier breaks down, they can't breed
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