Sexual Selection Flashcards
Powerful force for creating
Biodiversity
Growth limits reproduction and 1 reproductive event limits future reproductive events
Investment in 1 trait limits investment in another trait
These decrease fitness and should naturally be selected against
Sexual dimorphisms
Sexual selection used to explain
Antagonistic traits to natural selection
Anisogamy=
Production of different sized gametes
Anisogamy evolved by which mode of selection?
Disruptive selection
4 assumptions of anisogamy evolution:
Normal
No gametes depends on gamete size
Zygote viability depends on zygote size
Gametes released
2 Evolutionary Stable Strategies are dependent on whether zygote viability is strongly dependent on size:
Isogamy - no it isn’t
Anisogamy - yes it is
Batemans principle:
Makes mating success increases linearly with no of mates
Females should choose mates carefully because
They are the larger investor
Make mating success is more variable than females so
Variance has led to male competition
Intra sexual competition
Competition between sex with the limited access -usually males
Sexual size dimorphism and weapons increase success in which competition?
Intra sexual competition
Female choice influences make mating success
Inter sexual competition
Dominance/aggression: size and armaments
Intra sexual competition pre copulation