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Favoritism

Favoritism. Parental favoritism. Unequal allotment of resources to one or some of the genetic offspring. Sibling rivalry. Parents bring back food for the siblings to fight over, often to the death

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Favoritism

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  1. Favoritism

  2. Parental favoritism Unequal allotment of resources to one or some of the genetic offspring

  3. Sibling rivalry • Parents bring back food for the siblings to fight over, often to the death • Siblicide is advantageous to the winner, as he likely gains enough extra food to be able to produce more offspring as an adult • Does not compensate loss of progeny to the parent though, who discourages siblicide

  4. Siblicide

  5. Parents can control their children

  6. Discussion Question • Parent’s decision about incubation and hormone allocation put 2nd and 3rd eggs at risk for destruction or death. Why not save the energy that goes into producing those eggs? • One idea is the insurance policy; invest in a back-up egg in case the first egg doesn’t hatch, or something happens to the nestling. • How could you test the insurance hypothesis?

  7. Asynchrony encourages siblicide, but benefits parents

  8. How do parents know which young to invest in in synchronous broods?

  9. Red gape signals fitness

  10. UV reflectance an honest signal of health

  11. Human Favoritism • Exists • Basis for favoritism varies • Age, gender, phenotype similarity, weakness • Leads to sibling rivalry and competition for parents’ attention • Play up favored traits to the parent that appreciates them • Long lasting consequences

  12. Blended families

  13. Blended Families • Stepmothers, Foster Mothers • Spend less money on food • Step children receive average less education • Experience more abuse

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