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Symmetry in biology is about the overall shape of the body and its parts. The body plans of most multicellular organisms have some form of symmetry, radial symmetry, bilateral symmetry or spherical symmetry. A few have no symmetry, and are asymmetric.
Types of symmetry
There are three basic forms:
- Radial symmetry: The organism look like a pie. This pie can be cut up into roughly identical pieces.
- Bilateral symmetry: There is an axis; on both sides of the axis the organism looks roughly the same
- Spherical symmetry: If the organism is cut through its center, the resulting parts look the same.
When symmetry is not complete or not present at all.
The patterns on the wings of butterflies are one example of bilateral symmetry.
A starfish has radial symmetry.
Slime mold is asymmetric.