Presentation on theme: "Science AHSGE Standard VI-1, part 3- Adaptations."— Presentation transcript:
Science AHSGE Standard VI-1, part 3- Adaptations
Forerunner of Evolution Jean-Baptiste Lamarck- Theory of Inheritance of Acquired Traits Believed organisms changed behavior as a result of an environmental change As a result, physical changes followed with time which could then be inherited Incorrect, but on the right track!
Evolution Changes in an organism over time known to occur due to fossils Adaptation- Evolution of a structural, internal or behavioral feature to better suit the organism for survival Results from a change in the environment Theory of Natural Selection Survival of the fittest- organisms with the best genes survive and pass them on Causes a change in the gene pool Unfit genes die out or are bred out
Evolution Divergent Evolution- Development of more than one species from a common ancestor Ex: All dog breeds have been selectively bred from the wolf Convergent Evolution- Development of a common characteristic by more than one unrelated species due to living in similar environments Ex: Arctic mammals all have white winter coats
Structural Adaptations Mimicry- Copying of the appearance of other organisms for protection or other advantages Protective resemblance- Normally resembles plant structures Camouflage- Body color blends in with surroundings Spots and stripes break up body pattern Warning Coloration- Bright coloration to warn of danger Mechanical Defenses- Physical covering that allows for defending from predators or to aid in predation Ex: Claws, sharp teeth, quills, shells, etc.
Adaptations Charles Darwin Father of evolution Developed theory of natural selection Traveled on the H.M.S. Beagle to the Galapogos Islands Studied finches and beak size and shape Beaks of birds are adaptations for food type
Bird Beak Adaptations
Bird Feet Adaptations
Bird Wing Adaptations Penguin wing adapted for swimming
Behavioral Adaptations Migration- Movement of an animal from one place to another Common in birds and grazing mammals Brought on by climate change Hibernation- Period of dormancy during certain time-periods Common in reptiles and mammals of cold climates Brought on by climate change
Internal Adaptations Chemical defenses Development of mucus glands- secrete mucus for protection Toxin/Venom development