Evolution / Morphology
Evolution / Morphology
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What does homologous mean?
Same structure from common ancestry.
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What supports land vertebrates against gravity?
Arched vertebral column.
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Example of homologous structures?
Vertebrate arms: humerus, radius/ulna, wrist, hand.
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What do fish use for propulsion?
Body/axial skeleton movement.
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What does analogous mean?
Same function, different structure/origin.
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What are fish fins mainly used for?
Steering and balance.
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Example of analogous structures?
Bird wings and bat wings for flight.
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Why don’t fish need legs?
Water buoyancy supports them.
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What is the axial skeleton?
Skull, vertebral column, and body axis.
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What are tetrapods?
Four-limbed vertebrates.
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What is the appendicular skeleton?
Limbs plus pectoral and pelvic girdles.
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What does fossorial mean?
Adapted for burrowing.
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What animal is fossorial in the lab example?
Mole.
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What do snakes use for movement?
Body undulation so they move their body in side-to-side waves.
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What evidence shows snakes had legged ancestors?
Pelvis/femur remnants in boas and pythons.
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What is occlusion?
The way the teeth line up when the mouth closes.
