BIOLOGY 1M03 Lecture Notes - Lecture 12: Kin Selection, Cooperative Breeding
14 Jun 2020
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How can evolution explain helping others: kin selection (inclusive tness) Reciprocity: if the tness bene t to the recipient > the tness cost to the donor, both participants will gain. If the help is reciprocated at a later date: if not reciprocated, help should be withheld in future interactions, cooperation with a time delay, requires long term association (opportunity for reciprocation), individual recognition, detection and punishment of cheaters. Failure to share blood results in punishment (non-sharing to cheaters). Warning signals: bene t for some individuals to be in large groups or to protect some group members. Constraints on brain size increase: temperature sensitivity of the brain. Brains are highly sensitive to temperature and don"t function well in high heats: high metabolic cost of the brain (20% of resting metabolic cost, 2. 5% of body weight). Tuesday, march 6, 2018: first brain size increase corresponds to increased meat consumption - high quality food. Greatest decrease in tooth size in human evolution.
