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)
“All over this land women have no political existence. Laws pass over our heads that we can not unmake. Our property is taken from us without our consent. The babes we bear in anguish and carry in our arms are not ours.”
—Lucy Stone (1818–1893)
“This Administration has declared unconditional war on poverty and I have come here this morning to ask all of you to enlist as volunteers. Members of all parties are welcome to our tent. Members of all races ought to be there. Members of all religions should come and help us now to strike the hammer of truth against the anvil of public opinion again and again until the ears of this Nation are open, until the hearts of this Nation are touched, and until the conscience of America is awakened.”
—Lyndon Baines Johnson (1908–1973)