The specimen will contain 20% cytosine in it's DNA.
COMPONENTS OF DNA:
- DNA is a nucleic acid made up of nucleotide subunits. The four nucleotides that make up DNA structure are Adenine, Cytosine, Guanine and Thymine.
- Adenine and Thymine bonds together while Cytosine and Guanine bonds together i.e. A-T and G-C.
- According to Chargaff in his rule, in a DNA molecule, the amount of guanine (G) should be equal to cytosine (C) and the amount of adenine (A) should be equal to thymine (T).
- This means that, if a DNA specimen contains 30% Adenine (A), then it'll also contain 30% Thymine (T).
Since G = C and A = T
G + C + A + T = 100%
G + C + 30 + 30 = 100
G + C = 100 - 60
G + C = 40%
G/C = 40/2 = 20%
Therefore, G or C will be 20% each. Hence, the specimen will contain 20% cytosine in it's DNA.
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