Def: A type of natural selection favoring traits that improve mating success
Can be:
- Intrasexual: competition within a sex (male–male combat)
- Intersexual: mate choice (peacock tails, bird song)
Sexual chromosomes
- From a pair of homologous autosomes
人的智慧仿佛孔雀之羽翎，只是意在吸引配偶的浮夸呈现。所有艺术、文学，部分意义上的莫扎特，莎士比亚，米开朗基罗，以及帝国大厦等等，不过是精心策划的求偶仪式。
The human intellect was like peacock feathers. Just an extravagant display intended to attract a mate. All of art, literature, a bit of Mozart, William Shakespeare, Michelangelo, and the Empire State Building…just an elaborate mating ritual.