sexual selection
- Created by: mollskie49
- Created on: 08-06-13 20:01
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- sexual selection
- the nature of sexual selection
- Intrasexual Selection (Mate Competition)
- Members of one sex (usually males) compete with each other for access to members of the opposite sex.
- Victors able to mate, pass on genes
- Members of one sex (usually males) compete with each other for access to members of the opposite sex.
- Intersexual Selection (Mate Choice)
- Involves preferences of one sex for members of the opposite sex who possess certain qualities e.g. if a female prefers taller males sexual selection leads to an increase in taller males over time
- Preference of one sex determines the areas in which the other sex must compete
- Involves preferences of one sex for members of the opposite sex who possess certain qualities e.g. if a female prefers taller males sexual selection leads to an increase in taller males over time
- Intrasexual Selection (Mate Competition)
- short term mating preferences
- Parental investment (PI) theory
- Men evolved a greater desire for casual sex, ideally seeking sex earlier in r/s.
- Females not subjected to same evolutionary pressures
- Over a period of one year males can impregnate a large number of females but in the same time period females will only have one child – Buss
- Men appear to lower their standards in short term mating, then show a marked decrease in attraction following sex as an evolved adaption to bring out a hasty departure – Buss and Schmitt
- Over a period of one year males can impregnate a large number of females but in the same time period females will only have one child – Buss
- Females not subjected to same evolutionary pressures
- Men evolved a greater desire for casual sex, ideally seeking sex earlier in r/s.
- long term mating preferencinng
- Both sexes invest heavily in offspring
- High levels of choosiness
- Poor long term mating is a waste of valuable resources
- Women have an obligatory biological investment
- So predicted to be very choosy
- Attracted to males with ability to invest resources in herself and kids, ability to protect herself and kids, promising parenting skills, sufficient compatibility ensuring minimal cost to herself and kids – Buss
- So predicted to be very choosy
- Women have an obligatory biological investment
- Poor long term mating is a waste of valuable resources
- High levels of choosiness
- Both sexes invest heavily in offspring
- Parental investment (PI) theory
- Sex differences in human mate preferences
- Buss – what males and females look for in a marriage
- Women desire mates with good financial prospects, translated to resource acquisition and ambition
- Men place more importance on physical attractiveness
- Research shows that physical attractiveness provides cues to women’s health and reproductive value
- Men also prefer younger mates
- Both sexes wanted intelligence, kindness and dependability
- Men also prefer younger mates
- Research shows that physical attractiveness provides cues to women’s health and reproductive value
- Men place more importance on physical attractiveness
- Women desire mates with good financial prospects, translated to resource acquisition and ambition
- Buss – what males and females look for in a marriage
- The logic of sexual selection
- Random mating is stupid mating
- Genetic quality of a mate will determine half the genetic quality of the offspring
- By joining forces with an attractive high quality mate, offspring are higher quality and individual’s genes more likely to be passed on
- Genetic quality of a mate will determine half the genetic quality of the offspring
- Random mating is stupid mating
- mate choice in real life
- studies suffer from problems with validity
- however many real life studies support mate choice hypothesis
- men who divorce tend to remarry younger women
- however many real life studies support mate choice hypothesis
- studies suffer from problems with validity
- the nature of sexual selection
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