Sunday 22 February 2009

John Constable The White Horse

John Constable The White HorseJohn Constable The Hay WainJohn Constable Salisbury CathedralJohn Constable Salisbury Cathedral from the Meadows
analysis of the biological costs vs benefits.Sequential hermaphroditism naturally occurs in various organisms from plants to fishes. Following four decades of research that established why sex change is advantageous, the question remained why it is rare among animals. In this study, Yale graduate student Erem Kazancıoğlu and his advisor sex make hermaphroditism unfeasible for most animals."
To test whether the biological costs of changing sex affect sex change actually occurs, the researchers built theoretical models of the hermaphrodite and separate-sex histories. In their "game" models, sex change "players" vary the age of their sex change, while the separate-sex strategy responds by altering the number of male and female offspring it produces.Suzanne Alonzo, assistant professor of ecology and evolutionary biology, demonstrate that sex While the adaptive advantage of sex change is well understood, it is not clear why relatively few animals change sex. According to Alonzo, "An intuitive, yet rarely studied, explanation is that the considerable time or energy it takes to change

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