Understanding:
5.1.U4 : Evolution of homologous structures by adaptive radiation explains similarities in structure when there are differences in function. Objective:
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Application:
5.1.A1: Comparison of the pentadactyl limb of mammals, birds, amphibians, and reptiles with different methods of locomotion.
Objectives:
5.1.A1: Comparison of the pentadactyl limb of mammals, birds, amphibians, and reptiles with different methods of locomotion.
Objectives:
- Define pentadactyl limb.
- List the bone structures present in the pentadactyl limb.
- Identify pentadactyl limb structures in diagrams of amphibians, reptiles, birds and mammals.
- Relate differences in pentadactyl limb structures to differences in limb function.
A classical example of homologous structures is the pentadactyl limb in a variety of different animals
Despite possessing similar bone arrangements, animal limbs may be highly dissimilar according to the mode of locomotion:
- Mammals, birds, amphibians and reptiles all share a similar arrangement of bones in their appendages based on a five-digit limb
Despite possessing similar bone arrangements, animal limbs may be highly dissimilar according to the mode of locomotion:
- Human hands are adapted for tool manipulation (power vs precision grip)
- Bird and bat wings are adapted for flying
- Horse hooves are adapted for galloping
- Whale and dolphin fins are adapted for swimming
Comparison of Pentactdyle Limbs