________ regard an organism as being adapted to a particular environment when they can demonstrate that a slightly different organism reproduces and survives less well in that environment.
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Hardy Weinberg
Populations in nature never meet the conditions for ________ equilibrium, which is why we can say all biological populations evolve.
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mechanism of evolution
The ________ proposed by Charles Darwin.
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origin of genetic variation
The ________ is mutation.
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Darwin
________ realized that many more individuals of most species are born than survive to reproduce.
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Darwinian evolution
Most often refers to organic or ________, which is the genetic and resulting phenotypic change in populations of organisms from generation to generation.
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Genetic variation
________ within species is maintained in geographically distinct populations.
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Hardy Weinberg
________ only applies to sexually reproducing organisms.
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Evolution
Any gradual change
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Evolutionary Theory
The understanding and application of the mechanisms of evolutionary change to biological problems
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Descent with Modification
Darwins premise that all species share a common ancestor and have diverged from one another gradually over time
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Natural Selection
The differential contribution of offspring to the next generation by various genetic types belonging to the same population
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Artificial Selection
Selective breeding of organisms, commonly practiced by animal and plant breeders, to increase the frequency of a favored trait from one generation to the next
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Population
In ecology, a group of individuals of the same species that live, interact, and reproduce together in a particular geographic area
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Alleles
A specific form of a gene at a given locus on a chromosome, among multiple possible forms
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Gene Pool
All of the different alleles of all of the genes existing in all individuals of a population
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Allele Frequency
The proportion of each allele in a gene pool
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Genotype Frequency
The proportion of each genotype among individuals in a population
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Adaptation
In evolutionary biology, a particular structure, physiological process, or behavior that makes an organism better able to survive and reproduce
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Gene Flow
Exchange of genes between populations through migration of individuals or movements of gametes
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Genetic Drift
Changes in gene frequencies from generation to generation as a result of random (chance) processes
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Population Bottleneck
A period during which only a few individuals of a normally large population survive
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Founder effect
Random changes in allele frequencies resulting from establishment of a population by a very small number of individuals
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Sexual Selection
Selection by one sex of characteristics in individuals of the opposite sex
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Genetic Structure
The frequencies of the different alleles at each locus and the frequencies of the different genotypes in a population
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Hardy-Weinberg Equilibrium
The expected frequencies of alleles and genotypes in a population under random mating, in the absence of natural selection, mutation, migration, and genetic drift
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Fitness
An individuals contribution of genes to the next generation, as a consequence of its success in surviving and reproducing
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Stabilizing Selection
Selection against the extreme phenotypes in a population, so that the intermediate types are favored
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Directional Selection
Selection in which phenotypes at one extreme of the population distribution are favored
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Disruptive Selection
Selection in which phenotypes at both extremes of the population distribution are favored
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Purifying Selection
The elimination by natural selection of detrimental characters from a population
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Positive Selection
Natural selection that acts to establish a trait that enhances survival in a population
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Frequency-Dependent Selection
Selection that changes in intensity with the proportion of individuals in a population having the trait
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Clinal Variation
Gradual change in the phenotype of a species over a geographic gradient
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Genetic Drift
________: Changes in gene frequencies from generation to generation as a result of random (chance) processes.
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Natural Selection
________: The differential contribution of offspring to the next generation by various genetic types belonging to the same population.
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allele frequencies
Founder effect: Random changes in ________ resulting from establishment of a population by a very small number of individuals.
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Population
________: In ecology, a group of individuals of the same species that live, interact, and reproduce together in a particular geographic area.
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Fitness
________: An individuals contribution of genes to the next generation, as a consequence of its success in surviving and reproducing.
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Genetic Structure
________: The frequencies of the different alleles at each locus and the frequencies of the different genotypes in a population.
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evolutionary biology
Adaptation: In ________, a particular structure, physiological process, or behavior that makes an organism better able to survive and reproduce.
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Alleles
________: A specific form of a gene at a given locus on a chromosome, among multiple possible forms.
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Clinal Variation
________: Gradual change in the phenotype of a species over a geographic gradient.
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Population Bottleneck
________: A period during which only a few individuals of a normally large population survive.
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Genotype Frequency
________: The proportion of each genotype among individuals in a population.
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Hardy Weinberg
________ Equilibrium: The expected frequencies of alleles and genotypes in a population under random mating, in the absence of natural selection, mutation, migration, and genetic drift.