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Evolution is a change in the heritable characteristics or allele frequencies of a population over generations.
Evolution is the change in the heritable characteristics of biological populations across successive generations. In genetic terms, it is commonly described as a change in the frequencies of alleles within a population. Evolution can occur even when there is no visible change in an organism’s phenotype because some genetic differences do not affect observable traits. Evolution requires heritable genetic variation, which can arise through mutation, genetic recombination, and gene flow. Natural selection, genetic drift, and other evolutionary processes cause some genetic variants to become more or less common over time. Across Earth's history, these changes have produced biodiversity, including adaptation, the formation of new species, changes within species, and extinction.
Evolution is a change in the heritable characteristics or allele frequencies of a population over generations.
Genetic variation arises through mutation, sexual recombination, and gene flow.
Natural selection increases the prevalence of traits that improve survival and reproduction in a particular environment.
Genetic drift can change allele frequencies by chance, especially in small populations.
Evolution depends on heritability, meaning that genetic characteristics can be passed from parents to offspring.
Evolution may occur without a visible change in phenotype because not all genetic differences affect observable traits.
Evolutionary processes have produced biodiversity through adaptation, speciation, anagenesis, and extinction.
The change in the heritable characteristics of biological populations over successive generations.
One of two or more alternative forms of a gene at a specific location, or locus, on a chromosome.
A group of interbreeding organisms of the same species living in a particular area.
The capacity of a characteristic to be transmitted genetically from parents to offspring.
A change in the DNA sequence that can create new genetic variation.
The process by which heritable traits that improve survival or reproduction become more common in a population.
A random change in allele frequencies within a population, particularly influential in small populations.
The movement and exchange of genes between populations or species.
The complete set of genetic information possessed by an organism.
The observable characteristics of an organism resulting from the interaction of its genotype and environment.
An organism’s relative ability to survive and reproduce, thereby contributing genes to future generations.
The evolutionary process through which new species arise.
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