What would be the percentage of thymine in a double stranded DNA sample which contains 20% cytosine of the total bases?

10%

20%

30%

40%

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Molecular Basis Of Inheritance

Question

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What would be the percentage of thymine in a double stranded DNA sample which contains 20% cytosine of the total bases?

10%

20%

30%

40%

Solution

C.

30%

In DNA, purines (adenine and guanine) and pyrimidines (cytosine, thymine) occur in equal amount.

Adenine pairs with thymine and guanine pairs with cytosine. Hence, in a DNA sample if,

C = 20% then, G = 20%

So, A or T = $\frac{100 - (20 + 20)}{2}$ = 30%

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