Multiple Choice
Which of the following best describes a wild type in genetics?
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1. Introduction to Genetics
Fundamentals of Genetics
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If a DNA molecule in an organism contains 24% cytosine, what percentage of adenine will it contain?
A
48%
B
26%
C
24%
D
52%
Verified step by step guidance1
Recall Chargaff's rules, which state that in a double-stranded DNA molecule, the amount of cytosine (C) equals the amount of guanine (G), and the amount of adenine (A) equals the amount of thymine (T). This means $\%C = \%G$ and $\%A = \%T$.
Given that the DNA contains 24% cytosine, use Chargaff's rule to determine that guanine also makes up 24% of the DNA.
Calculate the combined percentage of cytosine and guanine: $\%C + \%G = 24\% + 24\%$.
Since the total percentage of all four bases must equal 100%, subtract the combined percentage of C and G from 100% to find the combined percentage of adenine and thymine: $100\% - (\%C + \%G)$.
Divide the combined percentage of adenine and thymine by 2 to find the percentage of adenine alone, because $\%A = \%T$.
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