Morphology and Homologous, Analogous, and Vestigial Structures
Homologous structures are body parts in different organisms that have a similar underlying anatomy due to common ancestry but may serve different functions. They indicate evolutionary relationships despite functional differences.
Homologous Structures
Homologous structures are when two organisms have a similar structure but have a different function.
Key Terms
Homologous Structures
Homologous structures are when two organisms have a similar structure but have a different function.
How do homologous structures support evolution?
Structures are similar, which shows a common ancestor.
Analogous Structures
Analogous structures are when two organisms have different structures but serve a similar function.
How do analogous structures support evolution?
Animals with no common ancestor but with a shared environment all become similar because it is effective in that environment.
What is the difference between homologous and analogous structures?
Homologous structures share an ancestor but serve a different function but analogous structures serve a similar function but do not share an ancest...
Vestigial Structures
Vestigial structures are traits that our ancestors needed but no longer serve a purpose in our environment.
Related Flashcard Decks
Study Tips
- Press F to enter focus mode for distraction-free studying
- Review cards regularly to improve retention
- Try to recall the answer before flipping the card
- Share this deck with friends to study together
| Term | Definition |
|---|---|
Homologous Structures | Homologous structures are when two organisms have a similar structure but have a different function. |
How do homologous structures support evolution? | Structures are similar, which shows a common ancestor. |
Analogous Structures | Analogous structures are when two organisms have different structures but serve a similar function. |
How do analogous structures support evolution? | Animals with no common ancestor but with a shared environment all become similar because it is effective in that environment. |
What is the difference between homologous and analogous structures? | Homologous structures share an ancestor but serve a different function but analogous structures serve a similar function but do not share an ancestor. |
Vestigial Structures | Vestigial structures are traits that our ancestors needed but no longer serve a purpose in our environment. |
How do vestigial structures support evolution? | Our ancestors used the in the past and it provided an advantage for them but as the species evolved the trait stayed but became ineffective to a changed environment. |
Examples of Homologous Structures | Mammalian forelimbs (monkeys, humans...) |
Examples of Analogous Structures | Flippers/fins/wing on aquatic animals |
Examples of Vestigial Structures | Whale Pelvic Bones, appendix, tailbone, wisdom teeth in humans, muscles that can move ears. |
Homologous Structures | |
Analogous Structures | |
Vestigial Structures |