BIOL 12100 Lecture Notes - Lecture 21: Cost Overrun, Natural Selection, Gene Expression
24 Feb 2015
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Energetic cost / risk of predation risk. Natural selection should have greater benefits than costs. Low distance from egg to eggshell have lower probability of predation. Portion of stimulus evolves response (fixed action patterns) => sign stimuli (releaser) Realistic model without red belly => no aggression. Unfishlike models with red belly => aggression. Chicks respond differently to the same shape flown in different direction. They respond based on the silhouette of the goose and the hawk. Odors => pheromones trigger behavior insects mating => female releases (small molecules) => go downward to males. Series of steps in definite order courtship to completion. Killer bees are aggressive and italian bees are passive. Males sparrow in isolation => not develop normal song. But if hear song adult males between 10-50 days => sing the song (200 days) Particular response to stimulus without reward or punishment at particular age. Metronome + food for a dog => metronome alone can salivate the dog.
