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Exploring Types of Adaptations: Physiological, Behavioral, and Sexual Selection

This content delves into various adaptations in organisms, highlighting physiological traits such as metabolism, blood clotting, and toxic secretions, as seen in poisonous frogs. It also examines behavioral adaptations, including instinctual reactions like migration and hunting, demonstrated through examples like lichen-eating moths affected by industrial melanism. Further, the concept of sexual selection is explored, showcasing how organisms compete for mates through displays, physical traits, and reproductive strategies. Understanding these adaptations is crucial for comprehending evolution and survival in changing environments.

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Exploring Types of Adaptations: Physiological, Behavioral, and Sexual Selection

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  1. Where did we leave off?

  2. Types of Adaptations 2. Physiological: inherited traits that involve the regulation of bodily processes and internal functions—metabolism, blood clotting, hibernation • Toxic secretions Poisonous Frog http://www.pbs.org/wnet/nature/episodes/christmas-in-yellowstone/video-hibernating-bear/4454/

  3. Types of Adaptations 3. Behavioral: inherited traits that are instinctual reactions to the environment—migrations, hunting, tracking, breeding, defenses, nursing Salamander video 5th hour: Cheetah Video

  4. Case Study:Where is the Moth? Sudden change in the environment due to increased pollution from the Industrial Revolution. Kills off most lichen on trees. Trees darkened by soot.

  5. Case Study: Industrial Melanism • What is the selection pressure? • What specific type of adaptation does the moth population rely on? • What type (directional, stabilizing, or disruptive) of selection is occurring in the gene pool?

  6. Hey wait a second… • I’ve seen a lot of inherited traits that seem in opposition to the adaptations just mentioned… • To ADVERTISE! • To COMPETE! • Survival is only ½ of fitness! • What about reproduction?

  7. Sexual Selection—acts on the ability of an organism to obtain and copulate with a mate Females Choose Males Compete • Looking for the best genes • High investment • Limited reproduction • Some can reject unwanted • sperm • Gain mate attention: ornamentation, visual, mating displays and songs • Battle for territory and/or a mate: physical structures, size Sexual dimorphism

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