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Trisomy 21 or Down Syndrome was first described by John Langdon Hayden Down a Physician ( 1828-1896 AD) in The London Hospital in 1866 AD.In 1959, Lejeune and Jacobs et al independently determined -trisomy 21 as cause of Down Syndrome.
March 21st every Year is Marked as ” Down Syndrome Day” – 3rd month 21st
Karyotype-
Trisomy 21: 47 XX or XY …
An ulcer is defined as an area of discontinuity of the surface epithelium. You can remember the mnemonic "DRESSINGS 
Most of you must have heard about the "For Dummies" series of books which provides knowledge to the readers wh 
