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Terms in this set (32)
(Is a population event) Drastically reduces the size of a population.
May be caused by various events, such as an environmental disaster, the hunting of a species to the point of extinction, or habitat destruction that results in the death of organisms.
(Called Darwinian _____) The genetic contribution of an individual to the next generation's gene pool relative to the average for the population, usually measured by the number of offspring or close kin that survive to reproductive age.
A mode of natural selection in which a single phenotype is favored, causing the allele frequency to continuously shift in one direction
A mode of natural selection in where this is the opposite of disruptive selection, in where it reduces the phenotypic variation and maintains the status quo
(Also called diversifying selection) This describes changes in population genetics in which extreme values for a trait are favored over intermediate values.
The diversification of a group of organisms into forms filling different ecological niches
The hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change.
Survival of Fittest
The continued existence of organisms that are best adapted to their environment, with the extinction of others, as a concept in the Darwinian theory of evolution.
A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendixes.
A branching diagram showing the cladistic relationship between a number of species.
A group of organisms believed to have evolved from a common ancestor, according to the principles of cladistics
(Used by paleontologists) This refers to the total number of
that have been discovered, as well as the information derived from them.
Evidence of Evolution
The theory of evolution by natural selection, which was formulated by Darwin.
The process by which organisms change over time as a result of changes in heritable, physical, or behavioral traits.
The branch of biology that deals with the formation, early growth, and development of living organisms.
Evidence for which species apart of a clade can be obtained from the base sequence of a gene or the corresponding amino acid.
The branch of biology that deals with geographical distribution of plants and animals.
The stock of different genes in an interbreeding population
(Gene Frequency) Is the relative frequency of an allele at a particular locus in a population, expressed as a fraction or percentage. Specifically, it is the fraction of all chromosomes in the population that carry that allele.
(Gene Migration) The transfer of alleles or genes from one population to another.
Migration into or out of a population may be responsible for a marked change in allele frequencies.
Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
(Adaptive Trait) Is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection.
The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
Developed the theory of evolution and it forms the basis for modern life sciences. Famous books are "The Origin of Specieland The Descent of Man"
The process whereby organisms better adapted to their environment tend to survive and produce more offspring
Now the main process that brings about evolution.
Natural selection arising through preference by one sex for certain characteristics in individuals of the other sex.
The breeding of animals and plants to produce desirable traits. Organisms with desired traits, such as size and taste are mated with other organisms of the desired trait.
An example of an organ or a bone that appears in different animals, demonstrating the descent from a common ancestor. In other words, it's when different animals have bones that appear very similar in form or function and seem to be related.
Pertain to the various structures in different species having the same function but have evolved separately, thus do not share a common ancestor.
The formation of a new and distinct species in the course of evolution.
The influence of closely associated species on each other in their evolution.
The process whereby organisms not closely related, independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.
The process by which a species evolves into two or more descendant or different forms.
The process of tracing two or more species back to a common ancestor.
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