
Crick and Watson's DNA Molecular Model
1953
1953
1919
1949
1917
1918-1920
1920-1950
1915-1918
1934
1948-1953
1930-1939
1901-1930
circa 1919
1935
1949
1945-1955
1925-1935
1957
1939-1955
1945
1942
1920-1950
circa 1910
1935
1918
1955
1903
1920-1925
1898
1917
1950-1952
1920-1950
1801-1840 (original); 1901 (model)
1920-1930
1920-1950
1951
c.1912
1903
1938
1940
1926-1932
1905
1938
1926
1926-1936
1953
1931
after 1903
2000-100 BCE
1900-1909
1917-1918