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Definition
| The process of a population becoming better fit to its environment through natural selection; a characteristic that makes a population better fit to its environment. |
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| The percentage of all alleles at a given locus in a population represented by a specific allele. |
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| Evolution that takes place within a single lineage. |
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| Mating between individuals where the choice of mate is influenced by phenotypes. |
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| Changes in allele frequencies that occur when a population experiences a period of extreme contraction, often including loss of alleles. |
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| Selection in which one of the extreme forms of a trait is favored, resulting in a shift in the population toward the favored extreme. |
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| The origin of new types of organisms from pre-existing types, involving descent with modification. |
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| The principle that when a small sample of a source population establishes itself as a separate colony, the colony will carry only part of the genetic variation of the source population, and the allele frequencies in the colony will differ from those of the parent population. |
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| Transfer of genes from one population to another through migration, leading to a change in allele frequencies. |
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| All of the alleles represented in the reproducing members of a population. |
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| Random changes in allele frequency within a population resulting from sampling error during reproduction. |
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| In a population the proportion of individuals that have a particular genotype. |
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| Hardy-Weinberg equilibrium |
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Definition
| A stable genotype distribution maintained by a randomly mating population from generation to generation in the absence of agents of evolution. |
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Definition
| Situation in which heterozygote individuals are more fit than either homozygote. |
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| Situation in which individuals are more likely to mate with close relatives than with nonrelatives. |
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| Processes by which species and higher groupings of organisms originate, change and go extinct. |
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Definition
| Evolutionary changes that occur within a species over a relatively short time period, including changes in the genetic structure in a population leading up to formation of a new species. |
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Definition
| Movement of individuals from one population to another. |
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| Mating between individuals in which the choice of mate is influenced by genotypes. |
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| A biological system that consists of all the members of a particular species in a local area, separate from other groups of the same species in other areas. |
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| Branch of genetics that examines the genetic composition of populations and changes in the genetic composition over time. |
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Definition
| Situation in which reproducing members of a population choose mates without regard to genotypes. |
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Definition
| The probability of survival and reproduction for a particular genotype compared to others. |
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Definition
| Disproportionate contribution of alleles to the next generation by individuals of favored genotypes. |
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