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Lecture 7

PSY353H5 Lecture 7: PSY353- Lecture 7 Notes

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University of Toronto Mississauga
Melissa Holmes

PSY353 Lecture 7 Notes: Romantic Relationships Lecture 7: Romantic Relationships know the main findings of each scientific reading for the exam, know what they test and find, types of things we discuss in class (like format and structure of the article) need to have romantic relationships in order to have offspring species shown have longterm relationships with one partner and biparental Romantic Relationships Defined: mutually exclusive most species have mechanisms of avoidance for mating with other family members sex and love are distinctly different in humans but not so much in animals Underlying Paradox: bad to breed with related individuals genetically have certain mechanisms that create familyrelated avoidance What are Romantic Relationships for? humans create an environment to raise their children and grow successfully meeting the needs of the offspring fish dont do this offspring never have a relationship with their parents The Lifecycle of a Romantic Relationship (depends on the mating system): in animals and many human romantic relationships start because individuals are attracted to one another leads to infatuation species dependent if you need sex to keep a relationship going species variability Polygamy (polygyny and polyandry): in mammals, polygyny is the most common most reproductive success in males Promiscuity: both males and females are having sex with lots of different members of the opposite sex Sexual Selection: getting good genes from this male so that the sons will be seen as attractive and can obtain mates Who Competes and Who Chooses? size of the gametes is important (males have smaller gametes, making females eggs more expensive and requires more effortenergy) in males the investment in care of young is variable depending on species sexual dimorphism: different characteristics between male and females Females often make the first move: females give a cue that they are reproductively ready Kin Recognition and Mate Choice: MHC genes that are involved to recognizing whether a tissue is yours or compatible with you, turns on an immune response looked at whether or not the alleles were similar with the study population had women smell the tshirt of the males (slept in males tshirt for 2 nights) in the paternal allele she prefers men who share that allele use olfactory cues to make preferences Pheromones in humans? women living together synchronize their menstrual cycles expose them the swabs of armpit odor during certain stages of their cycle (olfactory)
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