When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Evolution - Wikipedia

    en.wikipedia.org/wiki/Evolution

    Evolution in organisms occurs through changes in heritable characteristics—the inherited characteristics of an organism. In humans, for example, eye colour is an inherited characteristic and an individual might inherit the "brown-eye trait" from one of their parents. [21]

  3. Experimental evolution - Wikipedia

    en.wikipedia.org/wiki/Experimental_evolution

    Other evolutionary forces outside of mutation and natural selection can also play a role or be incorporated into experimental evolution studies, such as genetic drift and gene flow. [3] The organism used is decided by the experimenter, based on the hypothesis to be tested.

  4. Evolutionary biology - Wikipedia

    en.wikipedia.org/wiki/Evolutionary_biology

    Some examples of evolution in species over many generations are the peppered moth and flightless birds. In the 1930s, the discipline of evolutionary biology emerged through what Julian Huxley called the modern synthesis of understanding, from previously unrelated fields of biological research, such as genetics and ecology, systematics , and ...

  5. Introduction to evolution - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_evolution

    The theory of evolution explains these homologous structures: all four animals shared a common ancestor, and each has undergone change over many generations. These changes in structure have produced forelimbs adapted for different tasks. [49] The bird and the bat wing are examples of convergent evolution.

  6. Natural selection - Wikipedia

    en.wikipedia.org/wiki/Natural_selection

    Richard Lenski's classic E. coli long-term evolution experiment is an example of adaptation in a competitive environment, ("improvement in fitness" during "survival of the fittest"). [65] The probability of a beneficial mutation occurring on some member of the lineage to give improved fitness is slowed by the competition.

  7. Genome evolution - Wikipedia

    en.wikipedia.org/wiki/Genome_evolution

    The principal forces of evolution in prokaryotes and their effects on archaeal and bacterial genomes. The horizontal line shows archaeal and bacterial genome size on a logarithmic scale (in megabase pairs) and the approximate corresponding number of genes (in parentheses).The effects of the main forces of prokaryotic genome evolution are denoted by triangles that are positioned, roughly, over ...

  8. Disruptive selection - Wikipedia

    en.wikipedia.org/wiki/Disruptive_selection

    It is believed that disruptive selection is one of the main forces that drive sympatric speciation in natural populations. [12] The pathways that lead from disruptive selection to sympatric speciation seldom are prone to deviation; such speciation is a domino effect that depends on the consistency of each distinct variable.

  9. Alternatives to Darwinian evolution - Wikipedia

    en.wikipedia.org/wiki/Alternatives_to_Darwinian...

    For example, evolutionists like Edward Drinker Cope believed in a combination of theistic evolution, Lamarckism, vitalism, and orthogenesis, [88] represented by the sequence of arrows on the extreme left of the diagram. The various alternatives to Darwinian evolution by natural selection were not necessarily mutually exclusive.