relationships Flashcards
(106 cards)
sexual reproduction
concerns selection of those characteristics that aid reproduction
anisogamy
differences between female and male sex cells - gametes
male sex cell vs female sex cells
sperm-
- small
- highly mobile
- continuously created in vast numbers from puberty to old age
- do not need much energy to be produced
egg-
- large
- static
- produced at intervals for a limited number of fertile years
- require vast amounts of energy
consequence of anisogamy
no shortage of fertile male but a fertile female is much rarer ‘resource’
The two types of anisogamy
INTER SEXUAL SELECTION
INTRA SEXUAL SELECTION
Inter sexual selection
inter =
BETWEEN
- strategies used by male/female to select their partners
- preferred selection of the female
- Females invest more of their time; being pregnant/ giving birth/ looking after the baby = loose more if they make substandard choice.
what is the female optimum mating strategy
to select a genetically fit partner who is able to provide resources
features are passed onto their offspring
Runaway process
height example she selects height more height men hence we are left with men who are just tall. (characteristic becomes exaggerated)
sexy sons hypothesis
- fisher et al
- a female who mates with a male who has a certain characteristic then will have sons who will inherit that same ‘sexy’ trait
- then her sons will also be selected because of that trait by other females and this will then carry on.
Intra-sexual selection
INTRA=
-WITHIN
- Between males to be the one who gets selected. = plenty supply fro sperm
- its a competition - winner = passes down their characteristics other than the losers traits getting passed down. as they don’t mate
Dimorphism
Males and females end up looking very different dues to intra selection
e.g physical competition size matters
larger men are likely to be reproductively more successful
vs females as they don’t need to look big and the best as
females:
- large waist hip ratio
- young = more fertile
behavioural consequences
- deceitfullness
- agression
- intelligence
research support for inter-sexual selection
-female + male psychology students out across a university campus
- with the question “i have been noticing you around campus, I find you very attractive. Would you go to bed with me tonight./
75% males did agree
0% females agreed
= women are more specific when it comes to choosing their partner hence have a partner preference
and that men have a different strategy
However
too simplistic
- one for all one for only one?
- sexual strategies theory - strategies are the same when it comes to looking for long term partners
- both are very choosy - look for partners who are
- loyal
- loving
- kind
research support for intra sexual selection
- survey
10,000
33 countries
evolutionary theory preferences are important?
female greater emphasis on resource related characteristics than men did
- e.g. ambition
males valued: physical attractiveness and youth
- reproductive value
supports the differences in partner preference from sexual selection theory
social and cultural influences underestimated
social + cultural partner preferences
- availability of contraception
- womens greater role in workforce means they are no longer that dependent on the men.
- hence female preferences are no longer resource oriented
- partner preferences are a combination of evolutionary + cultural influences
evaluation
research support for intra sexual
research support for inter sexual
social and cultural changes
homosexuality?
evolutionary explanations for partner preferences
sexual selection
anisogamy
inter sexual selection
intra sexual selection
Factors affecting attraction
self-disclosure
self disclousure
revealing information about themselves
- gradual reveal
this can stenghten a relationship
likes dislikes deepest secrets
researchers
ALTMAN + TAYLOR
social penetration theory
revealing inner self to someone
deepest thoughts and feelings
reciprical exchange of information between intimate partners
sensitive infirmation
i trust you
parteners penetrate further into eachothers lives
breath and depth of self-disclosure
- As both of these increase attraction also increases they become more committed to each other
Outer layer of the onion
- low risk
information would be revealed to anyone