literature and science. It wasn’t until the late 19th century, however, that
published in 1866, which earned Down the recognition as the “father” of
the syndrome. Although other people had previously recognized the
characteristics of the syndrome, it was Down who described the condition
as a distinct and separate entity.
researchers to investigate the characteristics of people with Down
syndrome. In 1959, the French physician, Jerome Lejeune, identified Down
syndrome as a chromosomal anomaly. Instead of the usual 46
individuals with Down syndrome. It was later determined that an extra
partial or complete 21st chromosome results in the characteristics
associated with Down syndrome.