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Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...
John Langdon Down. John Langdon Haydon Down (18 November 1828 – 7 October 1896) was a British physician best known for his description of the genetic condition now known as Down syndrome, which he originally classified in 1862. He is also noted for his work in social medicine and as a pioneer in the care of mentally disabled patients.
This is a list of people with Down syndrome, a condition also known as Down's syndrome or trisomy 21. Down syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [1] It is typically associated with developmental delays, characteristic physical features, and mild to moderate intellectual disability ...
Genetics of Down syndrome. Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on chromosome 21, either in whole (trisomy 21) or part (such as due to translocations). The effects of the extra copy varies greatly from individual to individual, depending on the extent of the extra copy ...
The city of El Paso acquired the property on which the Plaza is located in 1881 from William T. Smith. Smith had bought the land from the heirs of its early owner, Juan Maria Ponce de Leon, a prominent El Paso figure, who had owned the spot since 1827. The square had since been the location of the corrals for de León’s ranch.
Contents. University of Texas at El Paso. The University of Texas at El Paso (UTEP) is a public research university in El Paso, Texas. It is a member of the University of Texas System. UTEP is the second-largest university in the United States to have a majority Mexican American student population (about 80%) after the University of Texas Rio ...
El Paso (song) " El Paso " is a western ballad written and originally recorded by Marty Robbins, and first released on Gunfighter Ballads and Trail Songs in September 1959. It was released as a single the following month, and became a major hit on both the country and pop music charts, becoming the first No. 1 hit of the 1960s on both.
The El Paso and Southwestern Railroad began in 1888 as the Arizona and South Eastern Railroad, a short line serving copper mines in southern Arizona. Over the next few decades, it grew into a 1200-mile system that stretched from Tucumcari, New Mexico, southward to El Paso, Texas, and westward to Tucson, Arizona, with several branch lines, including one to Nacozari, Mexico.