PSYC 3100 Lecture Notes - Lecture 12: Operational Sex Ratio, Stag Beetle, Parental Investment

• School: University of Guelph
• Department: Psychology
• Course: PSYC 3100
• Professor: Pat Barclay

Document Summary

More ability to choose from all the competitors. In humans, females have a larger minimal parental investment: the minimum an individual can contribute to the child, in males, minimum investment is a couple of minutes and a little bit of sperm. (in most species) 55th percentile: when it gets to dating or marrying someone, college males and females meet and both agree on choosiness, and both want someone of the 65 percentile or higher. Polygyny: any mating system where one male mates with more than one female (gorilla) Polyandry: one female mates with more than one male (ex. Monogamy: one male with only one female (geese) Polygynandry: multiple males will mate with multiple females (chimps) free for all. Effective polygyny: (variance in male rs /divided /by variance in female rs) >1. Effective polyandry: (variance in male rs/ divided/ by variance in female rs) <1. Effective monogamy: (variance in male rs/ divided/ by variance in female rs) =(approx. )