GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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22.5%
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27.5%
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45%
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55%
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Detailed explanation-1: -As per the question, the amount of A and T makes 45%. Therefore the percentage of C and G put together will account for 55%. Thus, the amount of guanine in that DNA will be 55/2 = 27.5%.
Detailed explanation-2: -It is given that the total amount of thymine and adenine is = 45%, then the total amount of Guanine and cytosine will be equal to 100%-45% = 55%. Also, % G = % C, Therefore-%G =% C = 55 %/2 = 27.5 %. So, the percentage of Guanine in DNA will be equal to 27.5 %.
Detailed explanation-3: -Amount of guanine is equal to cytosine. So, amount of guanine in DNA will be 55/2 = 27.5%.
Detailed explanation-4: -Therefore, Guanine would be 20% and total of G+C = 40% and hence A+T would be 60% that is 30% each. Hence, option C is correct answer.
Detailed explanation-5: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine. Erwin Chargaff determined that species have almost equal levels of adenine and thymine, and guanine and cytosine.