Fisher's Principle

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

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Rudolph Fisher - Biography
... 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
... 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)