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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90
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80
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40
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20
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Detailed explanation-1: -The correct answer is 40%. In DNA, adenine (A) always bonds with thymine (T), while guanine (G) always bonds with cytosine (C). So, the percentages of A and T will be equal, while the percentages of G and C would also be equal. In this sample, there exist 10% of guanine, therefore there’s also 10% of cytosine.
Detailed explanation-2: -Therefore, adenine will make up 10 percent and thymine will also make up 10 percent of the total DNA content.
Detailed explanation-3: -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-4: -It means the amount of guanine will be equal to cytosine and the amount of adenine will be equal to thymine. In the given problem, adenine is 20%. Hence, thymine will be 20%. So the percentage of cytosine and guanine will be 30% each.
Detailed explanation-5: -Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.