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Question

Which of the following varies from species to species?

A
A = T
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B
C = G
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C
A + G = C + T
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D
AT/GC ratio
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Solution

The correct option is D AT/GC ratio
By Chargaff's rule,
Percentage of adenine = percentage of thymine and percentage of guanine = percentage cytosine, for any species on earth.
That is, A=T and G=C.
Adding the two, we get,
A+G=T+C
Clearly AT/GC ratio must be the answer.
Indeed this is true. The AT/GC ratio varies from person to person.
Everyone has a unique DNA and this uniqueness is due to the difference in AT/GC ratio.

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