classification of organisms in kingdom animalia. structure function genetics embryology organisms...
TRANSCRIPT
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Classification of OrganismsIn Kingdom Animalia
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Structure
Function
Genetics
Embryology
Organisms are
Classified in 4 Major Ways:
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A. APPENDAGES
- Structures that extend from the core of the
body.
Ex: legs, antennae, arms, fins, wings, flippers, etc.
Structure
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B. Segmentation
•Segmented:
Clearly differentiated subdivision of an organism or part
Ex: insects, spiders•Non-Segmented: No Division of animal parts.Ex: humans, dogs, cats, lions, etc.
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C. SYMMETRY
1. Asymmetrical: No definite shape or form. No halves look alike
Ex: Sea Sponge
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C. SYMMETRY
2. Radial: Appendages extend from a central axis.
Ex: Starfish
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C. SYMMETRY
3. Bilateral Symmetry: Animals with right and left sides. “Mirror images”
Ex: Humans, crabs, etc.
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D. Cephalization
Cephalization: Concentration of sensory and neural organs toward the front of the head.
Ex: Your eyes, ears, nose, and mouth are located around the head region.
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E. Endoskeleton vs. Exoskeleton
1. “ENDO” – inside, meaning the skeleton is found inside of the body.
Ex: humans and dogs
2. “EXO” – outside, meaning an external covering that provides protection and support
EX: insects, arthropods, armadillos
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F. Sessile vs. Non-Sessile
Sessile – An organism is permanently attached to a solid object at its base.
Ex: sponge, sea anemone
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G. Body Covering
•Scales
•Skin
•Feathers
•Fur
•Hair
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H. Coelom
Coelom – A CAVITY formed within the mesoderm.
•Acoelomate – without a coelom Ex: sponges, flatworms
•Pseudocoelmate – “False” coelom. Cavity lined with mesoderm and endoderm. Ex: roundworms
•Coelomate – Cavity with 3 germ layers that allows organs to be attached.
Ex: earthworms, molluscs, humans
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I. Body System
Internal Systems are good for identification
Examples:
•Human stomach vs. cow (“ruminant”)
•Solid vs. hollow bones
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II. FUNCTION
•What is the function of the organism?
•Predator or Prey?
•Herbivore? Carnivore? Omnivore?
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III. GENETICS
Evolutionary history can help us group organisms.
Every organism has certain body proteins and sequences of DNA.
Ex: If you are examining two bird species, you can determine relationships by comparing proteins found in the egg whites.
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IV. Embryology
EMBRYOLOGY – Branch of biology concerned with the development of an organism.
•Embryo development is life’s building program.
•A few cells duplicate, grow, and specialize over time into a complex organism made of MANY cells!