Vestigial structures

Definition

Vestigial structures are anatomical features that have lost their original function through the course of evolution. They provide evidence for common ancestry and evolutionary history.

5 Must Know Facts For Your Next Test

1. Vestigial structures indicate a shared evolutionary past between species.
2. The human appendix is an example of a vestigial structure.
3. Vestigial structures can still have minor or secondary functions even if the primary function is lost.
4. Darwin cited vestigial organs as evidence for evolution by natural selection.
5. In whales, pelvic bones are considered vestigial, reflecting their land-dwelling ancestors.

Review Questions

• What are vestigial structures and how do they support the theory of evolution?
• Can you name two examples of vestigial structures in humans or other animals?
• Why are vestigial structures considered important evidence for common ancestry?

Related terms

Homologous Structures: Anatomical features in different species that share a common ancestor but may serve different functions.

Analogous Structures: Features in different species that perform similar functions but do not share a common ancestral origin.

Evolutionary Biology: The study of the origins and changes in the diversity of life over time.