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All bilaterians have some asymmetrical features; for example, the human heart and liver are positioned asymmetrically despite the body having external bilateral symmetry. [14] The bilateral symmetry of bilaterians is a complex trait which develops due to the expression of many genes. The bilateria have two axes of polarity.
Bilateria (/ ˌ b aɪ l ə ˈ t ɪər i ə /) [5] is a large clade or infrakingdom of animals called bilaterians (/ ˌ b aɪ l ə ˈ t ɪər i ə n /), [6] characterised by bilateral symmetry (i.e. having a left and a right side that are mirror images of each other) during embryonic development.
English: Illustrating different forms of symmetry in biology - the three main forms (bilateral, radial and spherical). Cartoon form generated using shapes from biorender. To be used in the symmetry in biology page.
Animals with bilateral symmetry as an embryo, i.e. having a left and a right side that are mirror images of each other. This also means they have a head and a tail (anterior-posterior axis) as well as a belly and a back (ventral-dorsal axis).
Cephalization is a characteristic feature of any animal that habitually moves in one direction, thereby gaining a front end. In practice, this primarily means the bilaterians, a large group containing the majority of animal phyla. [3]
Humans find bilateral symmetry in faces physically attractive; [51] it indicates health and genetic fitness. [52] [53] Opposed to this is the tendency for excessive symmetry to be perceived as boring or uninteresting. Rudolf Arnheim suggested that people prefer shapes that have some symmetry, and enough complexity to make them interesting. [54]
The axial twist takes place in the early embryo of a vertebrate. There is an evolutionary pressure for animals towards bilateral symmetry, due to sexual selection (better looks to potential mates) and functional selection (e.g., better locomotion). The evolutionary pressure decreases with better symmetry.
Symmetry in biology#Bilateral symmetry To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .