Analogous structures

Definition

Analogous structures are body parts in different species that have similar functions but evolved separately, not from a common ancestor. They arise due to convergent evolution where different organisms adapt similarly to comparable environments.

5 Must Know Facts For Your Next Test

1. Analogous structures result from convergent evolution.
2. They exhibit similar functionality despite having different anatomical origins.
3. An example of analogous structures is the wings of birds and insects.
4. They do not indicate a close evolutionary relationship between species.
5. Analogous structures differ from homologous structures, which have a common ancestral origin.

Review Questions

• What is the primary difference between analogous and homologous structures?
• Can you name an example of analogous structures and explain why they are considered analogous?
• How do analogous structures support the concept of convergent evolution?

Related terms

Homologous Structures: Structures in different species with a common ancestral origin, even if their functions differ.

Convergent Evolution: The process by which unrelated organisms independently evolve similarities when adapting to similar environments.

Divergent Evolution: The accumulation of differences between closely related populations leading to speciation.