
Crick and Watson's DNA Molecular Model
1953
1953
1953
1948-1953
1940
1934
1936
1935
1936
1945
1949
1945-1948
1949
1951
1925-1926
1950
1830 (original); 1967 (model)
1948-1953
1950
1947
1935
1930
circa 1930
circa 1942
1945
1931
1947
1924
circa 1930
1935
1940
1934-1935
1932-1936
2000-100 BCE
1927
1931
1930-1931
1928
1934
1937
1937
Before 1932
before 1928
1932
1935
1935
1926
1940
1950-1953
1948
1932