Term
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Definition
| Average percent of population's loci that are heterozygous. |
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Term
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Definition
| The ability of natural selection to maintain diversity in a population |
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Term
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Definition
| Natural selection that maintains stable frequencies of two or more phenotypic forms in a population (balanced polymorphism). |
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Term
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Definition
| Genetic drift in a population, usually from a natural disaster, such that the new population is not representative of the old one |
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Term
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Definition
| A graded variation in a trait that mirrors gradient variation in the environment |
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Term
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Definition
| Natural selection that favors individuals on the top of the phenotypic range |
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Term
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Definition
| Favors individuals on both extremes of the phenotypic range |
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Term
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Definition
| Contribution an individual makes to the gene pool of the next generation, relative to other individuals |
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Term
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Definition
| Genetic drift occurring when a few individuals become isolated from a larger population |
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Term
| Frequency-dependent selection |
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Definition
| A decline in the reproductive success of a morph resulting from the morph’s phenotype becoming too common in a population; a cause of balanced polymorphism in populations. |
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Term
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Definition
| Genetic additions or subtractions from a population |
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Term
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Definition
| Total aggregate genes in a population |
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Term
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Definition
| Fluctuations in allele frequencies because of a population's size |
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Term
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Definition
| Existence of two or more distinct alleles at a given locus |
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Term
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Definition
| Differences in gene pools |
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Term
| Hardy-Weinberg equilibrium |
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Definition
| Describes a population that is not evolving |
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Term
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Definition
| The principle that frequencies of alleles and genotypes in a population remain constant from generation to generation, provided that only Mendelian segregation and recombination of alleles are at work. |
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Term
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Definition
| Preserves variation because of greater reproductive success |
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Term
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Definition
| Individuals of one sex are choosy in choosing their mate |
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Term
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Definition
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Term
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Definition
| Change in the genetic makeup of a population |
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Term
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Definition
| A comprehensive theory of evolution emphasizing populations as units of evolution and integrating ideas from many fields, including genetics, statistics, paleontology, taxonomy, and biogeography. |
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Term
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Definition
| Rare change in the DNA of a gene |
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Term
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Definition
| Variation that carries no selective advantage |
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Term
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Definition
| The existence of two or more distinct morphs (discrete forms), each represented in a population in high enough frequencies to be readily noticeable |
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Term
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Definition
| Coexistence of two or more distinct forms in a population |
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Term
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Definition
| Localized group capable of interbreeding and creating fertile offspring |
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Term
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Definition
| Study of population genetics |
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Term
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Definition
| A DNA segment very similar to a real gene but which does not yield a functional product; a gene that has become inactivated in a particular species because of mutation |
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Term
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Definition
| A special case of polymorphism based on the distinction between the secondary sex characteristics of males and females |
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Term
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Definition
| Favors intermediate variants instead of extreme phenotypes |
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