Image of Erwin Chargaff
The DNA molecule is shaped like a twisted ladder.
Erwin Chargaff talks about his discovery â a major step for building the DNA model.
Erwin Chargaff found that in DNA, the ratios of adenine (A) to thymine (T) and guanine (G) to cytosine (C) are equal. This parity is obvious in the final DNA structure.
Erwin Chargaff talks about his name for Chargaff's ratios.
Erwin Chargaff reads a passage from his book Heraclitean Fire: Sketches from a Life Before Nature, describing his impressions of Crick and Watson.
James Watson and Francis Crick explain how they solved the structure of DNA. Erwin Chargaff explain how he measured the levels of each of the four nitrogenous bases.
The work of Erwin Chargaff and how it contributed to the downfall of Levene's tetranucleotide theory.
DNA nucleotides (black letter tiles) matched in groups of two to amino acids (red letter tiles).
A single DNA nucleotide undergoes a "point" mutation, changing an A to a T.