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Difficulty: MediumEvidence for Evolution: Comparative Anatomy, Embryology, and Vestigial Organs

The thorn of a Bougainvillea plant and the tendril of a passion flower both develop from axillary buds, despite serving different functional roles of defense and support, respectively. Which evolutionary process is illustrated by these structures?

  1. Divergent evolution leading to homologous structuresAnswer
  2. B
    Convergent evolution leading to analogous structures
  3. C
    Adaptive radiation giving rise to vestigial organs
  4. D
    Inheritance of acquired traits driven by environmental demand

Answer

Divergent evolution leading to homologous structures
Structures that share a common anatomical origin (both developing from axillary buds as modified stem structures) but perform different functions (climbing support versus defense) are defined as homologous structures. This structural pattern demonstrates divergent evolution from a common ancestral blueprint.

Step-by-Step Solution

1
Determine the anatomical origin and basic structure of both organs
Both the thorn of Bougainvillea and the tendril of the passion flower originate from axillary buds as modified shoots.
Structures sharing the same fundamental anatomical position and embryonic origin are defined as homologous structures.
2
Analyze the relationship between anatomical origin and specialized functions
Having a common ancestral origin while adapting to perform distinct functions (climbing support vs. defense against herbivores) demonstrates divergent evolution.
Divergent evolution occurs when a basic ancestral structure adapts along different lines to serve different ecological needs.

Key Concept

Homologous structures share a common embryonic and anatomical origin, serving as evidence of divergent evolution from a common ancestor despite performing different functions.
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Topics

Evidence for Evolution: Comparative Anatomy, Embryology, and Vestigial Organs

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