trisomía 21

trisomía 21

A genetically inherited form of mental retardation usually resulting from the inheritance of an extra autosome 21. Down syndrome individuals also typically are short and stocky in build with short appendages. They usually have broad round faces, saddle-shaped nose profiles, and thick tongues that are often stuck out of their mouths. The incidence of Down syndrome children goes up rapidly with the age of the mother, particularly after 40.

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Sinónimo(s) Down syndrome_₀
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Industria/ámbito: Antropología
Categoría: Antropología física
Company: Palomar College
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Trisomía-21

Arqueología; Evolución humana

A human clinical condition characterized by various abnormalities. It is caused by the presence of an extra copy of chromosome 21.

trisomía

Biología; Biología celular

A condition where a cell has an extra chromosome.

trisomía

Biología; Genoma

Possessing three copies of a particular chromosome instead of the normal two copies. See also: cell, gene, gene expression, chromosome.

trisomía

Biología; General

A condition where a cell has an extra chromosome.

enfermedad endémica

Antropología; Antropología física

A disease that remains at a more or less constant frequency of affected individuals in a population all of the time. Examples: hypertension, tooth decay, and malaria.

polimorfismo

Antropología; Antropología física

A genetic trait controlled by more than one allele, each of which has a frequency of 1% or greater in the population gene pool. See balanced polymorphism.

termoluminiscencia (TL)

Antropología; Antropología física

A radiometric dating method based on the fact that trace amounts of radioactive atoms, such as uranium and thorium, in some kinds of rock, soil, and clay produce constant low ...

modelo de asimilación

Antropología; Antropología física

A hypothesis to explain the origin of modern Homo sapiens. It proposes that the first modern humans evolved in Africa, but when they migrated into other regions they did not ...

potasio-argón

Antropología; Antropología física

A radiometric dating method based on the fact that potassium-40 in volcanic rock decays into argon-40 and calcium-40 at a known rate. The half-life of potassium-40 is ...

pedernal

Antropología; Antropología física

A kind of hard, rock with a glassy opaque appearance. It was a favorite raw material for many prehistoric humans for the manufacture of tools such as knives and scraping ...