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13 Cards in this Set
- Front
- Back
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What is sexual selection |
Selection for secondary sexual characteristic not explained by natural selection |
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Darwin mechanisms for evolution of sexual characteristics |
- intra sexual competition -inter sexual competition |
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Intra sexual competition devided into |
1. Contest 2.Scramble 3. Endurance rivalry |
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Natural vs sexual selection |
Evironment vs social selection
and mostly mail |
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Good gene models |
Handicap Model
Viability model |
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Sexually selected traits |
1. Behavior , Stiff legs in colombinae 2.Acoustic displays - wahoo yellow babooms 3Orgaments , Blue testes of vervets , throat sac and pihlanges or organhotan 4.Weapons - canine mandrill 5. Pelage /plumage 6.Skin coloration , gelada madnrill 7. Chemical signalls lemurs |
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Why females care about testosterone |
1. Better agonistic competition 2. Testorone supressed immune system = stronger genes needed to live |
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Sexual Coercision |
-Use force or threat of force to increase chance of mating with fertile female and reduce chance of her mating with soem other male |
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Paternal invesment |
- Any invesment that increases offspring chance of survival ( hense reproduction) at the parents cost of investing in other offspring |
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Paternal invesment conflicts |
1.Parent offspring weaning conflict 2. Succsessive offspring sibling rivalary 3.Parents battle of the sexes |
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Male vs female reproductive strategies |
1. Male , Low invesment , high variation in sucsess , limited by number of matings 2. Female , High investment , low variation , limited by nutrient rich food |
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Adaptation / evolution vs natural selection |
Adaptation / evolution - macro scale Natural selection - micro scale |
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Natural selection |
Based on -Overproduction -Variation -inheritance |
