Flashcards in Chapter 17 Deck (19):
Two types of sexual selection?
Intersexual and Intrasexual
Individuals of one sex select among individuals of the other sex as mates
*choosier ones tend to be females*
Members of one sex, most often males, compete with each other for mating access to the other sex
Three types of mating systems?
Male and female mater with each other and only each other during a given breeding system (can be lifetime or seasonal)
*think of humans*
Either males or females have more than one mate during a given breeding season or cycle
*can be polygyny or polyandry*
Males mate with more than one female per breeding season
Females mate with more than one male per breeding season
Both polyandry and polygyny, occurring at the same time
Several males form pair bonds with several females simultaneously
What is the limiting resource for selective processes?
Eggs are limiting resource, so males should compete for access
Females should be choosier sex because eggs are expensive
What is the difference between males being chosen by multiple or few to no females?
Multiple= high reproductive success
few or none= low reproductive success
Pre-mating ritual in which males and females are joined together often with one individual on the back of the other
genes that code for some suite of favorable traits
What are the two types of parasites & define them:
Ectoparasites: live on OUTSIDE of organism
Endoparasites: live on INSIDE of organism
Body coloration is a good proxy of parasite overload. Healthy males tend to be colorful, while diseased males are duller.
Runaway sexual selection
A gene that codes for a particular trait in males that over time becomes associated with a gene that codes for a particular behavioral mating preference in females.
(linkage disequilibrium arises between alleles for male phenotype and female preference)
Sensory exploitation model
Females initially prefer a certain male trait but not because of any mating benefit that is associated with that male trait.
(female's nervous system responds to trait because that's how they're "wired").