Question

Use the drop-down menus to decide if an example of similar traits is likely a homologous structure or an analogous structure.


Bird wings and dragonfly wings are both used for flight.

Clams and snails both have similar muscle structure even though the muscles do different jobs.

Human and giraffe necks both have 7 vertebrae because we are related.

The flaps of a Venus flytrap have a similar makeup to oak leaves.

Answer 1

1) Bird wings and dragonfly wings — Analogous
- Both used for flight but evolved independently (different structures/origins: vertebrate forelimb vs insect wing).

2) Clams and snails similar muscle structure — Homologous
- Both are mollusks and inherited similar muscle structures from a common ancestor, even if the muscles serve different functions.

3) Human and giraffe necks (both have 7 vertebrae) — Homologous
- The shared vertebral pattern is due to common ancestry among mammals.

4) Venus flytrap flaps and oak leaves — Homologous
- The trap flaps are modified leaves, so they share the same basic organ origin as oak leaves.