Fisher's principle is an evolutionary model that explains why the sex ratio of most sexual species is approximately 1:1. It was famously outlined by Ronald Fisher in his 1930 book The Genetical Theory of Natural Selection (but incorrectly attributed to Fisher as original). Nevertheless, A. W. F. Edwards has remarked that it is "probably the most celebrated argument in evolutionary biology". Specifically, Fisher couched his argument in terms of parental expenditure, and predicted that parental expenditure on both sexes should be equal. Sex ratios that are 1:1 are hence known as "Fisherian", and those that are not 1:1 are "non-Fisherian" or "extraordinary" and occur because they break the assumptions made in Fisher's model.
Read more about Fisher's Principle: Basic Explanation, Parental Expenditure, Development of The Argument, Fisher's Sources, Further Reading
Other articles related to "fisher":
... Charles Ian Fisher (born October 4, 1965) is an American journalist who is an associate managing editor at The New York Times ... Fisher graduated from Boston University in 1987 and began his newspaper career at The Sun in Lowell, Massachusetts ... From 1998 to 2001, Fisher was the New York Times' East Africa bureau chief (based in Nairobi, Kenya) ...
... to become manager of semi-professional side Fisher Athletic ... Fisher finished third in the Isthmian League Premier Division in season 2005–06 and beat Hampton Richmond 3–0 in the play-off final to win promotion to Conference South ... Edinburgh left Fisher by mutual consent in November 2006 ...
... Fisher is an unincorporated community on the South Branch Potomac River in Hardy County, West Virginia ... It may be named generally for the Fisher family that lived in its vicinity, or more specifically for George Fisher, whose family lived on the South Branch approximately one mile due south of ... Bean Settlement Brake Cunningham Durgon Fabius Fisher Flats Fort Run Furnace Inkerman Kessel Lost City Lost River Mathias McCauley McNeill Milam Needmore Old Fields Perry Peru Rig Rock Oak Rockland Tannery ...
... in Washington, DC in the late nineteenth century, Fisher grew up in Providence, Rhode Island graduating from Classical High School and attending Brown University ... Fisher married Jane Ryder in 1925, and they had one son, Hugh, who was born in 1926 ... In 1930, Fisher became superintendent of International Hospital, a black-owned private hospital on Seventh Avenue in Harlem, but the hospital went bankrupt in October 1931 ...
... Rudolph Fisher (May 9, 1897 Washington, DC - December 26, 1934) was an African-American physician, radiologist, novelist, short story writer, dramatist, musician, and orator ... Fisher's parents were John Wesley Fisher, a clergyman, and Glendora Williamson ... Fisher had three children ...
Famous quotes containing the words principle and/or fisher:
“The principle of the Gothic architecture is infinity made imaginable.”
—Samuel Taylor Coleridge (1772–1834)
“I know only one person who ever crossed the ocean without feeling it, either spiritually or physically.... he went from Oklahoma to France and back again ... without ever getting off dry land. He remembers several places I remember too, and several French words, but he says firmly, “We must of went different ways. I don’t rightly recollect no water, ever.””
—M.F.K. Fisher (1908–1992)