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14 BISC_120 BehavioralEvol

14 BISC_120 BehavioralEvol - Reminders Midterm#1 is Wed...

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1 1 Reminders • Midterm #1 is Wed. Sept 29 – Covers lectures 3-14 (Edmands) – Practice questions posted on Blackboard – 150 points total • 15 multiple choice questions (45 points) • 5 definitions (30 points) • 1 essay question (30 points) • 5 true/false questions (15 points) • 5 matching (15 points) • 3 short answer/ problem solving (15 points) • SI review session is Sun. Sept 26 7-9pm – SGM 123 and 124 2 51.1- 51.5 Behavioral Evolution 3 What Is Behavior? • Behavior – What an animal does and how it does it – Includes muscular and nonmuscular activity 4 Proximate vs. Ultimate Questions • Proximate, or “how,” questions about behavior – Focus on the environmental stimuli that trigger a behavior – Focus on the genetic, physiological, and anatomical mechanisms underlying a behavioral act
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2 5 • Ultimate, or “why,” questions about behavior – Address the evolutionary significance of a behavior 6 Schooling in fish • How? Sense movement of other fish by sight (eyes on sides of head) and lateral line • Why? Minimize predation, reduce friction 7 Ethology • The study of behavior, especially under natural conditions • Discipline developed in mid-1900s (Tinbergen, von Frisch, Lorenz) 8 Innate, no modification through learning Originates and is modified by learning Highly stereotyped Fixed, little variation Highly flexible Condition dependent Yawning Smiling Language acquisition Fixed action pattern
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3 9 Fixed Action Patterns (FAPs) • Sequence of unlearned behaviors that are largely unchangeable • Usually carried to completion once initiated • Triggered by external stimuli 10 Yawning is a FAP Consistent in length and appearance Difficult to stop once started!!
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