Portal:Evolutionary biology

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
The Evolutionary Biology Portal

Template:/box-header

Tree of life.svg
Evolutionary biology is a sub-field of biology concerned with the origin and descent of species, as well as their change, multiplication, and diversity over time. Biologically, evolution is the change in the inherited traits of a population from generation to generation. These traits are the expression of genes that are copied and passed on to offspring during reproduction. Mutations in these genes can produce new or altered traits, resulting in heritable differences (genetic variation) between organisms. New traits can also come from transfer of genes between populations, as in migration, or between species, in horizontal gene transfer. Evolution occurs when these heritable differences become more common or rare in a population, either non-randomly through natural selection or randomly through genetic drift.

Template:/box-footer

Show new selections below (purge)
edit  watch  

Selected article

In evolutionary ecology, mimicry describes a situation where one organism, the mimic, has evolved to share common outward characteristics with another organism, the model, through the selective action of a signal-receiver or "dupe". Collectively this is known as a mimicry complex. The model is usually another species except in cases of automimicry. The signal-receiver is typically another intermediate organism, e.g the common predator of two species, but may actually be the model itself (such as an orchid resembling a female wasp). As an interaction, mimicry is in most cases advantageous to the mimic and harmful to the receiver, but may increase, reduce or have no effect on the fitness of the model depending on the situation. Models themselves are difficult to define in some cases, for example eye spots may not bear resemblance to any specific organism's eyes, and camouflage often cannot be attributed to any particular model. Camouflage, in which a species appears similar to its surroundings, is essentially a form of visual mimicry, but usually is restricted to cases where the model is non-living or abiotic. In between camouflage and mimicry is mimesis, in which the mimic takes on the properties of a specific object or organism, but one to which the dupe is indifferent. The lack of a true distinction between the two phenomena can be seen in animals that resemble twigs, bark, leaves or flowers, in that they are often classified as camouflaged (a plant constitutes its "surroundings"), but are sometimes classified as mimics (a plant is also an organism). Crypsis is a broader concept that encompasses all forms of detection evasion, such as mimicry, camouflage, hiding etc.
edit  watch  

Selected picture

Tyrannosaurus rex
Credit: Commons:User:David Monniaux

Tyrannosaurus rex skull at Palais de la Découverte in Paris.

Template:/box-header

Evolutionary biology

Evolutionary biologists • Eugenics • Evolutionary biology literature • Evolutionary dynamics • Evolutionary game theory • Extinction • History of evolutionary biology • Human evolution • Microbial population biology • Molecular evolution • Mutation • Paleontology • Phylogenetics • Population genetics • Evolutionary psychology • Selection • Sociobiology • Speciation • Symbiosis • Tree of life •

Template:/box-footer

Template:/box-header

Question.png
  • ...that adaptations enable living organisms to cope with environmental stresses and pressures?
  • ...that maintained gene flow between two populations can also lead to a combination of the two gene pools, reducing the genetic variation between the two groups?
  • ...that all forms of natural speciation have taken place over the course of evolution, though it still remains a subject of debate as to the relative importance of each mechanism in driving biodiversity?
  • ...that despite the relative rarity of suitable conditions for fossilization, approximately 250,000 fossil species are known?
  • ...that genetic sequence evidence thus allows inference and quantification of genetic relatedness between humans and other apes?
  • ...that the human species has a common ancestor with the ape? (similar to above reference)

Template:/box-footer

Template:/box-header


Here are some tasks awaiting attention:

    Template:/box-footer

    Template:/box-header

    Community.png

    WikiProjects connected with biology:

    A complete list of scientific WikiProjects can be found here. See also Wikispecies, a Wikimedia project dedicated to classification of biological species.

    Template:/box-footer

    Template:/box-header

    Evolutionary biology fields— Cladistics • Ecological genetics • Evolutionary development • Human evolution • Molecular evolution • Phylogenetics • Population genetics
    Mechanisms— Natural selection • Genetic drift • Gene flow
    Outcomes— Adaptation • Co-evolution • Co-operation • Speciation • Extinction
    Research and history— Evidence of common descent • Evolutionary history of life • History of evolutionary thought • Modern evolutionary synthesis • Social effect of evolutionary theory • Objections to evolution
    Applications — Evolutionary algorithm •

    Template:/box-footer

    Template:/box-header

    Portal-puzzle.svg

    Related subjects

    Issoria lathonia.jpg
    90x63px
    Terra.png
    Astrolabe-Persian-18C.jpg
    Frans Hals - Portret van René Descartes.jpg
    Philippe de Champaigne Still-Life with a Skull.JPG
    Biology Chemistry Earth sciences History of science Philosophy of science Death
    Albert Einstein Head.jpg
    Mol Anth Ico.PNG
    Science Molecular
    Anthropology

    Topics in biology

    E coli at 10000x.jpg
    Earth Day Flag.png
    ExtinctDodoBird.jpeg
    Moorish idol.jpg
    Biological cell.svg
    Biotechnology Ecology Extinction Marine Life Molecular and
    Cell Biology

    Template:/box-footer

    Template:/box-header

    Evolutionary biology on Wikinews     Evolutionary biology on Wikiquote     Evolutionary biology on Wikibooks     Evolutionary biology on Wikisource     Evolutionary biology on Wiktionary     Evolutionary biology on Wikimedia Commons
    News Quotations Manuals & Texts Texts Definitions Images & Media
    Wikinews-logo.svg
    Wikiquote-logo.svg
    Wikibooks-logo.svg
    Wikisource-logo.svg
    30px
    Commons-logo.svg

    Template:/box-footer

    Purge server cache