PSYC 122 Lecture Notes - Lecture 12: Estrous Cycle, Photuris, Sexual Selection
Document Summary
Lecture 12: recognizing a mate 1- function; phylogeny 04-26-2019. Includes both direct (pass own genes/ own offspring) and indirect fitness (siblings" offspring: your direct fitness is your own offspring +1, your siblings" offspring have some shared dna with you as indirect fitness. +0. 5: explains why some animals invest more time in raising siblings and community offspring, mate recognition is sex-specific, classic view of mate recognition. Ideal male provide good genes: usually no paternal care. Identifying the wrong mate can be fatal: eg. fireflies have different light pulse patterns, light pulse identifies species and deters predators (toxic signal, bug photinus emulates female bug photuris. Intrasexual selection males are typically much larger than females (50%+ larger) large size is because of male-male competition. Intersexual selection females select for large males that can deter other males: other males try to kill females" offspring to show that their mate is weak. Intrasexual males are 30-40% physically larger than females.
