ection Mating preferences in Drosophila and pigeons Certainty of Maternity, Uncertainty of Paternity “Battle of the sexes” Cuckoldry —> jealousy Desertion —> Mating Rituals, Complex Courtship Sex that invests most in most choosy about mates Natural selection produces a correlation between male genetic quality and female preference “Sexy son” phenomenon (females cannot afford to mate with males that are not attractive to other ales) Mating systems, monogamy, polygamy, polygyny eshold Marsh nesting (wrens, blackbirds, jacanas) Pinniped harems and sexual size dimorphisms Floating populations of non-breeding males
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Intrasexual vs. intersexual (epigamic) sexual selection
Mating preferences in Drosophila and pigeons
Certainty of Maternity, Uncertainty of Paternity
“Battle of the sexes”
Cuckoldry —> jealousy
Desertion —> Mating Rituals, Complex Courtship
Sex that invests most in most choosy about mates
Natural selection produces a correlation between
male genetic quality and female preference
“Sexy son” phenomenon (females cannot afford to mate
with males that are not attractive to other females)
Four Possible Situations Involving an Individual’s Behavior and Its Influence on a Neighbor________________________________________________________________
Neighbor(s) Gain Neighbor(s) Lose________________________________________________________________Individual Gains Pseudo-altruistic behavior Selfish behavior
Ants, bees, wasps, hornets—all workers are females
Haplodiploidly
Isoptera (“same wings”)
Termites (castes consist of both sexes)
Endosymbionts
Parental manipulation
Cyclic inbreeding
“Adaptive Geometry of a Selfish Herd”
White-Fronted Bee Eater, Kenya
White-Fronted Bee Eater Colony
Female tossing out an egg
Helpers at the Nest in White-Fronted Bee Eaters in Kenya__________________________________________________________________Breeders r * Number of Cases % Cases__________________________________________________________________Father x Mother 0.5 78 44.8Father x Stepmother 0.25 17 9.8Mother x Stepfather 0.25 16 9.2Son x Nonrelative 0.25 18 10.3Brother x Nonrelative 0.25 12 6.9Grandfather x Grandmother 0.25 5 2.9Half brother x Nonrelative 0.13 3 1.7Uncle x Nonrelative 0.13 2 1.1Grandmother x Nonrelative 0.13 1 0.6Grandson x Nonrelative 0.13 1 0.6Great grandfather x Nonrelative 0.13 1 0.6Nonrelative x Nonrelative 0.0 20 11.5Total 174 100.0__________________________________________________________________* r = coefficient of relatedness.