[wp_quiz id=”14217″]

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# An analysis of a DNA (double-stranded) sample yielded 18% cytosine. What would be the percentage of other bases on this sample?

#### Erwin Chargaff proposed a rule called the Chargaff’s rules which states that in a double-stranded DNA segment, the ratio of purine bases (Adenine+Guanine) and the pyrimidine bases (Cytosine+Thymine) is equal to 1.0 and the number of Adenine is equal to the Thymine and the number of Guanine is equal to the number of Cytosine.

#### In the given DNA strand, if Cytosine is 18%, then the percentage of Guanine would be 18%, the percentage of Adenine would be 32%, and the percentage of Thymine would be 32%.

#### A+G=T+C —- 32+18=32+18 where A=T (32% each) and G=C (18% each)

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