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According to Eichler and Sankoff the two mean processes in eukaryotic chromosome evolution are 1) rearrangements of chromosomal segments and 2) localized duplication of genes. Clustering could be explained by reasoning that all genes in a cluster are originated from tandem duplicates of a common ancestor.
An arête is a thin ridge of rock that is formed by glacial erosion. [2] Pressure ridge (ice) An ice pressure ridge is a ridge of deformed ice along the boundaries of individual ice floes when the ice floes on a lake or ocean collide and compress their edges. The average height of a sea ice pressure ridge is between 5 and 30 meters. [8]
The apical ectodermal ridge (AER) is a structure that forms from the ectodermal cells at the distal end of each limb bud and acts as a major signaling center to ensure proper development of a limb. After the limb bud induces AER formation, the AER and limb mesenchyme —including the zone of polarizing activity (ZPA)—continue to communicate ...
In medicine, the term arcus superciliaris or the English translation superciliary arch. This feature is different from the supraorbital margin and the margin of the orbit. Some paleoanthropologists distinguish between frontal torus and supraorbital ridge. [2] In anatomy, a torus is a projecting shelf of bone that unlike a ridge is rectilinear ...
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
A crest is any of various anatomical features appearing as a raised point or ridge, most prominently those on the head or back of an animal. A part of a bone: Sagittal crest; Cnemial crest; Iliac crest; Frontal crest; Infratemporal crest; Anterior lacrimal crest; Posterior lacrimal crest; Buccinator crest; A feature on various animals: Crest ...
A mammary ridge, or crest, usually stops growing at eight weeks and its length is regressed starting at the caudal end and extending cranially, [1] so that what remains is a round, ectodermic placode where the axilla develops. When shortening of the mammary crest is complete, the structure remains prominent in the areas where the mammary glands ...
Ridge, a term used in dog breeding, meaning a ridge of hair that runs along the back in the opposite direction from the rest of the coat, e.g. on the Thai Ridgeback; Ridge Vineyards, a wine producer in the Santa Cruz Mountains of California