Dictionary » S » Symmetry



noun, plural: symmetries

Correspondence of parts (in terms of form, size, distribution, or arrangement) on opposite sides of a dividing plane or on sides around an axis


In biology, symmetry pertains to an attribute of organisms showing regularity in parts on a plane or around an axis. Symmetry may be:

  • bilateral symmetry – symmetry in which the opposite sides are similar; the external appearance is the same on the left and right sides in a sagittal plane (such as the body plan of most animals, including humans)
  • radial symmetry – symmetry in which the sides exhibit correspondence or regularity of parts around a central axis; lacking left and right sides (e.g. sea stars, sea anemones, jellyfish, sea urchins, and many flowers)

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Book recommendation for exam

... Acoelomata and Coelomata; Protostomes and Deuterostomes, Bilateralia and Radiata; Status of Protista, Parazoa, Onychophora and Hemichordata; Symmetry. 3. Protozoa : Locomotion, nutrition, reproduction; evolution of sex; General features and life history of Paramaecium, Monocystis, Plasmodium, ...

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by bertstare
Sun Oct 21, 2012 2:19 pm
Forum: Zoology Discussion
Topic: Book recommendation for exam
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Views: 6472


... The biological DNA is only a new shape of this universal matrix, with increased level of complexity. The formula is composed by bi-lateral symmetry in all aspects, so, in its energy also. There is the growing energy and the decaying energy, which could be oja e teja, or yin and yang. So, ...

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by TheMatrixDNA
Sun Jul 29, 2012 9:29 pm
Forum: General Discussion
Topic: The question of life...
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Please check my work?

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by radicali
Thu Jun 14, 2012 8:57 pm
Forum: General Discussion
Topic: Please check my work?
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Views: 2875

Evolution of the Face and Head

The generally-accepted connection is not with feeding, but with symmetry and movement - bilateral animals, with propulsion driven equally from 2 sides, wind up with a directionality and a front end. Packing sense receptors and processors there, to deal with ...

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by Darby
Thu May 10, 2012 2:15 pm
Forum: Evolution
Topic: Evolution of the Face and Head
Replies: 4
Views: 4027

Molecular gene (genome) concept scientifically untenable

... bulge called a bleb. This is like the locking of a door — a change in cell structure arresting cell activity. The cell membrane also loses symmetry and detaches from the cytoskeleton, which leads to cell shrinkage, nuclear fragmentation, chromatin condensation, chromosomal DNA fragmentation, ...

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by PAWahid
Wed May 02, 2012 4:54 am
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
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