Terms in this set (29)
A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
Selection that favors phenotypes at one extreme of a trait's range.
Selection that favors the intermediate (middle) phenotype
Selection that favors both extremes of a phenotype but not the intermediate.
Small changes occurring within species, such as changes in allele frequencies.
Evolution on a large scale affecting changes in species across populations
Proposed a theory of evolution based on use/disuse or by inheritance of acquired traits.
Hutton & Lyell
Theorized that the earth was very old, changing gradually over time.
Proposed a system of classification based on physical similarities.
Ability of an organism to survive and reproduce in its environment
All alleles in a given population
A change in the allele frequency of a population as a result of RANDOM CHANCE events rather than natural selection.
A change in allele frequency of a population as a result of immigration or emigration.
Non-random mating. Organisms select a sexual mate based on physical or behavioral traits that are not necessarily related to survival.
Idea that the allele frequences in a population will remain constant. In other words, there is no evolution taking place.
Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
Adaptive Radiation (divergent evolution)
A single species evolves into several species
Unrelated organisms independently evolve similarities when adapting to similar environments
Process by which two species evolve in response to changes in each other
Formation of new species
the study of where organisms live now and where they and their ancestors lived in the past
The study of structures
Structures in different species that are similar because of common ancestry
Body parts that share a common function, but not structure
Remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.
Biological study of embryos and their similarities in an effort to determine relatedness among organisms
Study of substances and processes occurring in living things
Study of fossils
Any fossilized remains of a life form that exhibits traits common to both an ancestral group and descendant groups