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Q9:
Can we call human evolution as adaptive radiation?
Solution :
Theoretical Definition of Adaptive Radiation
Adaptive radiation is an evolutionary process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches. The hallmark of adaptive radiation is the exploitation of different ecological niches by divergent species originating from a single common ancestor [Per the principles of Darwinian evolution and the concept of divergent evolution].
Analysis of Human Evolution
To determine if human evolution qualifies as adaptive radiation, we must evaluate the trajectory of the hominid lineage against the defining criteria of the process:
- Ancestral Origin: Human evolution involves a lineage originating from a common primate ancestor (hominoid stock).
- Niche Exploitation: Unlike classic examples of adaptive radiation (e.g., Darwin’s Finches in the Galápagos or Australian Marsupials), human evolution is characterized by anagenesis (evolution within a single lineage) and a successive replacement of species rather than a simultaneous radiation into diverse ecological niches.
- Environmental Specialization: Hominids did not diverge into multiple, co-existing species occupying distinct, non-overlapping ecological roles in the same environment. Instead, they progressed toward a singular, highly generalized niche: the use of complex tools, bipedalism, and encephalization.
Comparative Evaluation
| Criteria | Adaptive Radiation | Human Evolution |
|---|---|---|
| Speciation Pattern | Cladogenesis (Multiple branching) | Successional/Linear (Mostly anagenetic) |
| Ecological Niches | Divergent (Exploitation of various environments) | Convergent/Specialized (Increasing reliance on cognitive adaptation) |
| Outcome | Many species occupying diverse roles | One extant species ($Homo\ sapiens$) |
SVG Representation: Evolutionary Divergence vs. Human Lineage
Synthesis of Findings
Based on the biological evidence, human evolution cannot be strictly classified as adaptive radiation. While hominids underwent significant phenotypic changes, these were evolutionary adaptations aimed at improving fitness within a specific cognitive and social niche rather than a radiation into varied environments. The process is better described as evolutionary progression or lineage adaptation rather than adaptive radiation.
Final Solution: No, human evolution is not considered an adaptive radiation because it does not involve the rapid diversification of a single ancestor into multiple co-existing species occupying distinct ecological niches; rather, it reflects a progressive, largely linear evolutionary trend toward increased cognitive and physical specialization.
More Questions from Class 12 Biology Evolution EXERCISES
- Q1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q2: Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
- Q2: Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
- Q3: Attempt giving a clear definition of the term species.
- Q3: Attempt giving a clear definition of the term species.
- Q4: Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)
- Q4: Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)
- Q5: Find out through internet and popular science articles whether animals other than man has self-consciousness.
- Q5: Find out through internet and popular science articles whether animals other than man has self-consciousness.
- Q6: List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
- Q6: List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
- Q7: Practise drawing various animals and plants.
- Q7: Practise drawing various animals and plants.
- Q8: Describe one example of adaptive radiation.
- Q8: Describe one example of adaptive radiation.
- Q9: Can we call human evolution as adaptive radiation?
- Q10: Using various resources such as your school Library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.
- Q10: Using various resources such as your school Library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.
CBSE Solutions for Class 12 Biology Evolution
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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