In a DNA sample the proportion of A is 17%, the amount of G + T and C will be respectively.

50% and 33%

66% and 17%

66% and 33%

33% and 50%

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In a DNA sample the proportion of A is 17%, the amount of G + T and C will be respectively.

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Text solutionVerified

In any double stranded DNA, adenine (A) pairs with a thymine (T) and Guanine (G) pairs with a cytosine (C).
Now, since each A always pairs with a T, the percentage of A and T will always be the same. Therefore, percentage of T will also be 17%.
So we can conclude that A+T=17+17=34%
The rest would account for G+C which would be 100-34=66%, thus G+C=66%.

Now, since each G always pairs with a C, thus the individual proportions of G and C will be 33%.

So we get the base composition of DNA as A=T=17% and G=C=33%

Therefore, G+T=33+17=50% and C=33%.

Hence the correct answer is '50% and 33%'.

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