BSC 116 Lecture Notes - Lecture 35: Open Shell, External Fertilization, Internal Fertilization
4 Jun 2016
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Document Summary
Behavior: sum of all of an organism"s responses to stimuli. Nervous system determines how: stimuli sensed, sensory input processed, and to respond. Can be acted on by natural selection, if there is genetic variation. Ethology: the study of animal behavior in natural environments. Form many behaviors, a particular stimulus leads to a particular response. Taxis: moving toward or away from a stimulus. Example: fish orient upstream, moths fly toward a flame. Fixed action patterns: some triggers leads to a behavior; must be carried to completion. Example: male sticklebacks attack other male in their nests, graylag goose & egg rolling behavior. Communication: one animal"s signal leads to another"s response. Visual, chemical, tactile example: female fiddler crab moves toward a male waving his claw, minnows hide in the presence of alarm pheromone. The environment of an organism can influence its behavior. Innate behavior: traits that are fixed by genotype and development. Individuals with the same genotype can have different behavioral phenotypes.
