ZOO 4070 Lecture Notes - Lecture 7: Eusociality, Inbreeding, Robert Trivers
23 Mar 2016
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Wilson"s condiions: cooperaive care of young, overlap between generaions, reproducive division of labour, disinct sterile castes. Sterile caste of workers were evidence of the divine hand of the creator. Darwin: sterile castes of worker bees was one special diiculty which at irst appeared to me to insuperable and actually fatal to the whole theory . Males only have one set of chromosomes (haploid) while females have 2 (diploid) More proitable for sisters to help mothers raise future sisters rather than own ofspring: females have higher inclusive itness helping raise sisters, r=. 75. Haplodiploidy also explains why males do not help: males are more related to daughters than female siblings. Daughter r=1: more beneicial to simply reproduce. Robert trivers: females must also raise brothers. Sex raio and worker investment: classic sex raio theory predicts 50:50 female: male raio. If >50% of females, mothers have a higher itness payof for producing males.
