WEBVTT
Kind: captions
Language: en

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The DNA molecule is made up very long
chains of the four bases; A, C, G, and T.

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In 1950, Erwin Chargaff published a paper
stating that in DNA of any given species,

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the ratio of adenine to thymine is equal,
as is the ratio of cytosine to guanine.

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This is known as Chargaff's Ratios,

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and it was a crucial clue that
helped solve the structure of DNA.

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Chargaff's Ratios are universal;
all forms of life obey this rule.

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Only the balance of AT pairs and
CG pairs varies between species.