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Difficulty: EasyAdaptive Radiation and Mechanisms of Speciation

In evolutionary biology, which of the following best describes the process of adaptive radiation?

  1. The rapid evolution of a single ancestral lineage into diverse species adapted to specialized ecological nichesAnswer
  2. B
    The inheritance of somatic traits acquired by individual organisms during their lifetime in response to environmental pressure
  3. C
    The independent evolution of similar morphological features in unrelated organisms living in similar habitats
  4. D
    The continuous range of phenotypic variations exhibited by individuals within a single interbreeding population

Answer

The rapid evolution of a single ancestral lineage into diverse species adapted to specialized ecological niches
Adaptive radiation refers to the evolutionary process by which a single ancestral species rapidly diversifies into a variety of distinct descendant species, each specialized to occupy different ecological niches.

Step-by-Step Solution

1
Identify the core concept
The question asks for the definition and mechanism of adaptive radiation.
Understanding evolutionary terms requires distinguishing divergent speciation from other evolutionary processes.
2
Analyze the characteristic features of adaptive radiation
Adaptive radiation involves a single common ancestor colonizing or encountering diverse unexploited ecological niches, leading to rapid speciation and morphological divergence.
Niche specialization drives natural selection to favor distinct structural modifications in different subpopulations.
3
Evaluate the choices
The option specifying rapid evolution from a single ancestral lineage into species adapted to specialized niches correctly states this concept.
Other options confuse adaptive radiation with Lamarckism, convergent evolution, or continuous variation within a single species.

Key Concept

Adaptive Radiation
Estimated Time:45s
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Topics

Adaptive Radiation and Mechanisms of Speciation

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