runaway$71406$ - meaning and definition. What is runaway$71406$
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What (who) is runaway$71406$ - definition

SEXUAL SELECTION MECHANISM
Runaway evolution; Runaway sexual selection; Runaway selection
  • cryptic brown]]. <!-- David E. Hill and Jürgen C. Otto. Courtship display of the peacock spider Maratus aquilus (Araneae: Salticidae: Euophryini), December 2019.-->
  • sexually dimorphic]] species
  • The peacock tail in flight, the classic example of an ornament assumed to be a Fisherian runaway
  • The peacock, on the right, is courting the peahen, on the left.

Runaway train         
UNCONTROLLED MOVEMENT OF RAILWAY ROLLING STOCK
Runaway Train
A runaway train is a type of railroad incident in which unattended rolling stock is accidentally allowed to roll onto the main line, a moving train loses enough braking power to be unable to stop in safety, or a train operates at unsafe speeds due to loss of operator control. If the uncontrolled rolling stock derails or hits another train, it will result in a train wreck.
Fisherian runaway         
Fisherian runaway or runaway selection is a sexual selection mechanism proposed by the mathematical biologist Ronald Fisher in the early 20th century, to account for the evolution of ostentatious male ornamentation by persistent, directional female choice. An example is the colourful and elaborate peacock plumage compared to the relatively subdued peahen plumage; the costly ornaments, notably the bird's extremely long tail, appear to be incompatible with natural selection.
The Runaway Bus         
1954 FILM BY VAL GUEST
The runaway bus
The Runaway Bus is a 1954 British comedy film produced, written, and directed by Val Guest. It stars Frankie Howerd, Margaret Rutherford and Petula Clark and an ensemble cast of character actors in a story about a bus caught in fog while a gang of crooks tries to carry off a heist.

Wikipedia

Fisherian runaway

Fisherian runaway or runaway selection is a sexual selection mechanism proposed by the mathematical biologist Ronald Fisher in the early 20th century, to account for the evolution of ostentatious male ornamentation by persistent, directional female choice. An example is the colourful and elaborate peacock plumage compared to the relatively subdued peahen plumage; the costly ornaments, notably the bird's extremely long tail, appear to be incompatible with natural selection. Fisherian runaway can be postulated to include sexually dimorphic phenotypic traits such as behavior expressed by a particular sex.

Extreme and (seemingly) maladaptive sexual dimorphism represented a paradox for evolutionary biologists from Charles Darwin's time up to the modern synthesis. Darwin attempted to resolve the paradox by assuming heredity for both the preference and the ornament, and supposed an "aesthetic sense" in higher animals, leading to powerful selection of both characteristics in subsequent generations. Fisher developed the theory further by assuming genetic correlation between the preference and the ornament, that initially the ornament signalled greater potential fitness (the likelihood of leaving more descendants), so preference for the ornament had a selective advantage. Subsequently, if strong enough, female preference for exaggerated ornamentation in mate selection could be enough to undermine natural selection even when the ornament has become non-adaptive. Over subsequent generations this could lead to runaway selection by positive feedback, and the speed with which the trait and the preference increase could (until counter-selection interferes) increase exponentially.

Modern description of the same mechanism using quantitative genetic and population genetic models was mainly established by Russell Lande and Mark Kirkpatrick in the 1980s, and are now more commonly referred to as the sexy son hypothesis.