Question

When did Erwin Chargaff make his discovery?

Answer 1

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The first and best known achievement was to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units.

Answer 2

Explanation:

1949

In 1949, Chargaff discovered that the proportions of bases in DNA depend on the species the DNA comes from. This was a major break from what scientists had believed until then.