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Lecture 32: "Social Interactions"

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Western University
Biology 3466B
Yolanda Morbey

Evolution Lecture No. 32: Social Interactions I th Friday November 30 , 2012 EVOLUTION & HUMAN HEALTH: Fever In Chickenpox: -If acetaminophen lowers the onset of fever (a symptom of chickenpox), does it result in more symptoms? In chickenpox patients that took acetaminophen, itching due to chickenpox was prolonged, suggesting that there may be a benefit to having fever-like symptoms (inconclusive due to statistically- insignificant findings). Fever During A Cold: -Cold medication seems to prolong symptoms in the common cold as well, but perhaps through affecting the immune system and not necessarily through fever reduction (either reducing fever or immune response). Parent-Offspring Conflict: -Evolutionary theory predicts parents to invest more in genetic offspring than step offspring. The data shows the behaviours of the father (either parenting genetic or step offspring) and that he interacted way more with genetic offspring (consistent with hypothesis). -Do interactions depend on the length of association? In 14 homes where the father had genetic and step offspring, the percent interaction (whether positive of agonistic) is dependent upon genetics, and not the length of association between parent and offspring. -Are there any health consequences of being a step child? Well, step children were recorded to have higher incidences of the long-term stress hormone cortisol than genetic offspring and as a result of this, missed more school (were ill more often). Other factors that may have influenced this such as socioeconomic status were taken into consideration). -In terms of the long-term effects of being raised as a step child, both males and females that were raised as without a step parent matured to have a higher amount of offspring (higher reproductive success). Other factors to consider could be the fact that from 1974-1983, there was an increased risk in Canada for children to be killed by their step parent. SOCIAL INTERACTIONS Types Of Social Interactions: -There are 4 major kinds of behaviours between individuals in terms of costs and benefits to the actor and recipient of the interaction: cooperative (both actor and recipient benefit), selfish (the actor benefits but the recipient is harmed), altruistic (the recipient benefits but the actors is harmed), and spiteful (both actor and recipient are harmed). In nature, the order of social interactions in the order that they frequently occur is as follows: self
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