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
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
| 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 |