Anthro Human Evolution Neo Darwin
This deck covers key concepts in Neo-Darwinian anthropology, focusing on human evolution and adaptive radiation, including definitions, processes, examples, and related concepts such as mosaic evolution, homologous traits, and convergence.
Adaptive Radiation
Coined by:
Hitch and Osburn
Key Terms
Adaptive Radiation
Coined by:
Hitch and Osburn
How is adaptive radiation defined?
State that Progressive of similar organism into dissimilar organism.
2 Pre-requisition for Adaptive Radiation
There should be adaptive potential of the organism, which is based on biological characteristics or potential of the organism
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Darwin on Adaptive Radiation
It is different spokes radiating from center of hub of a wheel.
osburn on adaptive radiation
It is great variety of adaption to different environment/ niches.
Diagram and example of adaptive radiation
Divergent disruption of NS graph.
Galapagos finches
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| Term | Definition |
|---|---|
Adaptive Radiation Coined by: | Hitch and Osburn |
How is adaptive radiation defined? | State that Progressive of similar organism into dissimilar organism. |
2 Pre-requisition for Adaptive Radiation |
|
Darwin on Adaptive Radiation | It is different spokes radiating from center of hub of a wheel. |
osburn on adaptive radiation | It is great variety of adaption to different environment/ niches. |
Diagram and example of adaptive radiation | Divergent disruption of NS graph. Galapagos finches |
Mosiac Evolution | The rate of evolution in different part/trait of organism evolve at different rate. Bipedal motion and brain evolving. Brain evolved at much faster rate. |
Characteristics of Mosaic evolution | Bring changes in different part of the organs, stage by stage. Sets a flexible framework within which different organism have to grow and develop in relation to other part of organs |
What are the two ways to understand if 2 are sharing traits |
2. Share common environmental niche: Convergence |
Parallelism | Parallel evolution is independent of similar evolutionary adaptation or among closely related species. (imp) As a process in which 2 evolutionary line derive from common ancestor and evolve much in a similar way. |
Convergence | Evolution of similar adaptive trait in unrelated form or species Process where evolutionary development of similar trait and adaptation in 2 group of organism that are not closely related- philogenetically |
Homologous trait and it’s type. | Homologous structure is same in human, whale and dog |
Chronology | Notion that similar feature in 2 organism look same due to shared evolutionary history. Bones of human are same as flukes of the whale |
Analogous | There’ll be similar feature due to similar patterns of use, even those they are not related ancestrally Wing of bird and bat both use for flying but evolved independently although they don’t have any common ancestor. Hence wings are called Analogous and evolved through convergent evolution. |