Parental investment Flashcards
What is parental investment?
Any investment by a parent in an offspring that increases the offspring chance of survival at the parents expense of been able to invest in other offspring
What did Trivers suggest?
Males and females don’t invest equally because of the ratio of gazettes and possible chances to reproduce
How do members of the extended family invest?
Michalski et al (2005) found it went... Maternal grandmother Maternal grandfather Paternal grandmother Paternal grandfather
Why do women invest more?
Gazettes and number of possible reproductions
Head size
Breastfeeding
Child care
What are the costs of maternal investments?
Huge so random mating is more costly
What’s Symons quote?
The minimum paternal investment is a moment of copulation and a teaspoon of semen
What is cockuldry?
Raising and supplying recourses for another mans child
Evidence for differences in jealousy
Buss (1992) showed men and women different images of affairs. Found men were more distressed by sexual affairs and women by emotional
What are the costs and benefits for women of cockuldry?
More resources
Better genes
Abandonment
Violence
Study for the frequency of extra-marital affairs?
Baker and Bells (1990) surveyed 2700 women in a magazine and found 14% of the population had an affair
Study for menus preparation for parenting
Geer et al (2007) 91 non-parent graduates found men showed more ANS arousal when given situations about parenting
Evaluation against cockuldry?
Anderson (1999) found men don’t discriminate between step and biological children
