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22 Cards in this Set

  • Front
  • Back
process that enables organisms to become better suited to their environments
allelic frequency
how often certain alleles occur in a gene pool (as a % or a decimal)
analogous structures
structures that are similar in appearance and function but have different origins and usually different internal structures
artificial selection
technique in which the intervention of humans allows only selected organisms to produce offspring
principle that all life arises by the reproduction of pre-existing life
adaptations that allow an organism to blend into thier environment
gene pool
common group of genes shared by members of a population
genetic equilibrium
situation in which allelic frequencies remain constant
geographic isolation
form of reproductive isolation in which two populations are separated (ex. by mountains or bodies of water)
homologous structure
parts of different organisms, often quite dissimilar, that developed from the same ancestral body parts
assumption of color, form, or behavior patterns by one species of another species (ex. camoflagure patterns= protection)
condition in which an organism has extra sets of chromosomes
punctuated equilibrium
pattern of long stable periods interrupted by brief (1000s of years) periods of change
reproductive isolation
separation of populations so that they do not interbreed to produce fertile offspring
new species evolve from old species
marked difference or deviation from characteristic form, function or structure
vestigial structures
structure that serves no useful purpose or function to an organism (ex. human appendix)
binomial nomenclature
classification in which a species is named with a genus and a species (genus species)
science of naming organisms and assigning them to groups
groups into which organisms are classified
groups of organisms that share similar characteristics and can interbreed with one another to produce fertile offspring
group of closely related phyla