sexual selection Flashcards
evolutionary explanations for partner preferences
sexual selection and human reproductive behavior
outline the relationship bw sexual selection and human reproductive behavior- 6m
.
human reproductive behaviour
beh that rel to opportunities to reprod and thereby increase the survival chances of our genes
discus rel bw ss and hrb
.
intra-sexual selection
w/in sexes
males compete for access to the female
characteristics in those with greater reproductive fitness
winner reproduces an passes on chara which contributed to his victory-strength
leads to male-female dimorphism- accentuation of secondary sexual
inter-sexual selection
between sexes
females choose from available prospective
mates
key study- Buss
survey, 10k adults, 33 countries males-youth, looks-signs of fertillity females-ambition, financial prospects diff stategies due to anisogamy irrespective of culture
Singh
supp from wasit to hip ratio research
men pref 0.7
honest trait, x carrying another man’s child
sign of fertility
Clark and hatfield
supp for inter-sexual selection uni campus 'i find you attractive will you sleep with me tonight' 0 females yes 75% males yes- immediately females more choosy
Bereczkei
social norms change, due to changes in soc/cultural factors rather than evol
bereczkei-consequence- women’s pref no longer resource orientated
combination of evol and cultural infl, but this theory ignores
waynforth and dunbar
lonely hearts adverts in newspaper
women- physically attractive-youth
men- good resources, successful and ml to seek for phys att and youth
displays diff strategies of males and females
sexual selection
attributes or behavior that increase reproductive success are passed on and may become exaggerated over succeeding generations of offspring
anisogamy
diff bw male and female gametes
egg- more e req to sustain, satic rel large
sprem-
fisher
sexy sons hyp
trivers
females invest more time, commitment and resources b4, during and after birth
so consequence of chosing wrong partner worse for females
