Symmetrical Versus Asymmetrical Arms Races
Arms races may be classified as either symmetrical or asymmetrical. In a symmetrical arms race, selection pressure acts on participants in the same direction. An example of this is trees growing taller as a result of competition for light, where the selective advantage for either species is increased height. An asymmetrical arms race involves contrasting selection pressures, such as the case of cheetahs and gazelles, where cheetahs evolve to be better at hunting and killing while gazelles evolve not to hunt and kill, but rather to evade capture.
Read more about this topic: Evolutionary Arms Race
Famous quotes containing the words symmetrical, arms and/or races:
“The symmetrical piles of white bodies,
the round white breast-shapes of the heaps,
the smell of the smoke, the dogs the wires the
rope the hunger. It had happened to others.
There was a word for us. I was: a Jew.”
—Sharon Olds (b. 1942)
“Shall the Spring dawn, and she still clad in smiles,
And with an unscathed brow,
Rest in the strong arms of her palm-crowned isles,
As fair and free as now?
We know not; in the temple of the Fates
God has inscribed her doom;
And, all untroubled in her faith, she waits
The triumph or the tomb.”
—Henry Timrod (1828–1867)
“Listen, my friend, there are two races of beings. The masses teeming and happy—common clay, if you like—eating, breeding, working, counting their pennies; people who just live; ordinary people; people you can’t imagine dead. And then there are the others—the noble ones, the heroes. The ones you can quite well imagine lying shot, pale and tragic; one minute triumphant with a guard of honor, and the next being marched away between two gendarmes.”
—Jean Anouilh (1910–1987)