DNA is constructed of small molecules called nucleotides, and there are four different kinds of these molecules, A,T,C,G. These molecules are packaged into individual chromosomes, where all your genetic information is stored. Every human has 46 chromosomes per non-reproductive cell. 23 from the mother and 23 from the father. There are two of each chromosomes 1-22, and either an X or a Y in males and two X's in females.
THE HISTORY OF DNA
The pioneering research that revealed the structure of DNA was performed by British biophysicists,
Francis Crick and Maurice Wilkins and American biochemist, James Dewey Watson.
In 1953, Crick and Watsonwere able to complete a model of DNA. They used an
X-ray diffraction picture of the DNA molecule obtained by Williams in 1951 to
construct the model. In 1962 they received a nobel prize for physiology or medicine.
In 1959, American biochemist, Arthur Kornberg synthesized DNA that was not biologically active, and in
1967 he and a team of researchers at Stanford University sucessfully created
biologically active DNA from relatively simple chemicals.
The research and develpoment of DNA testing continued into the future and eventually lead to
DNA Fingerprinting
