17 terms

biology words

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evolution
all of the changes that have transformed life over an immense time
fossile
remains buried by sediments
speciation
formation of new species
half life
the time required for one half of the atoms of a radioisotope to emit radiation an decay products
variation
difference among members of a species
gene pool
consists of all the alleles [different forms of genes] in all the individuals of a population
species
Distinct form of life
natural selection
process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
adaptive radiation
evolution from a common ancestor of many species adapted to diverse environments
endosymbiosis
theory where mitochondria and chloroplasts are thought to have evolved from bacteria inside a cell
embryology
study of multicellular organisms as they develop from fertilized eggs to fully formed organisms
microevolution
evolution on the smallest scale—a generation-to-generation change in the frequencies of alleles within a population
geographic isolation
separation of populations as a result of geographic change or migration to geographically isolated places
adaptation
the process of developing character traits to fit in to a new enviroment
vestigial structures
remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.
extinct
species that no longer exist
population
a group of organisms of the same species populating a given area