Simple Price Equation
When the characters zi do not change from the parent to the child generation, the second term in the Price equation becomes zero resulting in a simplified version of the Price equation:
which can be restated as:
where vi is the fractional fitness: vi= wi/w. This simple Price equation can be proven using the definition in Equation (2) above. It makes this fundamental statement about evolution: "If a certain inheritable characteristic is correlated with an increase in fractional fitness, the average value of that characteristic in the child population will be increased over that in the parent population."
Read more about this topic: Price Equation
Famous quotes containing the words simple, price and/or equation:
“I went to a very militantly Republican grammar school and, under its influence, began to revolt against the Establishment, on the simple rule of thumb, highly satisfying to a ten-year-old, that Irish equals good, English equals bad.”
—Bernadette Devlin (b. 1947)
“Thou blind man’s mark, thou fool’s self-chosen snare,
Fond Fancy’s scum and dregs of scattered thought,
Band of all evils, cradle of causeless care,
Thou web of will whose end is never wrought;
Desire! desire, I have too dearly bought
With price of mangled mind thy worthless ware;”
—Sir Philip Sidney (1554–1586)
“A nation fights well in proportion to the amount of men and materials it has. And the other equation is that the individual soldier in that army is a more effective soldier the poorer his standard of living has been in the past.”
—Norman Mailer (b. 1923)