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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.
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 ...
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 ...
Alfredo Le Pera. " El día que me quieras " (English: The day that you love me) is an Argentine tango with music by Carlos Gardel and lyrics by Alfredo Le Pera. It is considered one of the most popular songs of the 20th century and one of the best Latin songs of all time. [1] Originally featured in the 1935 film of the same name, sung by Gardel ...
Paris syndrome. Paris syndrome (パリ症候群, Pari shōkōgun) is a cluster of psychiatric symptoms exhibited by some individuals when visiting Paris, that can be viewed as a severe form of culture shock. [1]
XX male syndrome, also known as de la Chapelle syndrome, is a rare intersex condition in which an individual with a 46,XX karyotype develops a male phenotype. [2] Synonyms for XX male syndrome include 46,XX testicular difference of sex development (or 46,XX DSD) [3] [4] [5] [6]
The Day of the Dead (Spanish: el Día de Muertos or el Día de los Muertos) [ 2 ][ 3 ] is a holiday traditionally celebrated on November 1 and 2, though other days, such as October 31 or November 6, may be included depending on the locality. [ 4 ][ 5 ][ 6 ] The multi-day holiday involves family and friends gathering to pay respects and to ...