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NEET 2022

Exam: NEET
Year: 2022
Subject: Zoology
Chapter: Molecular Basis of Inheritance

NEET 2022 · Zoology · Molecular Basis of Inheritance

If A and C make 30 \% and 20 \% of DNA, respectively, what will be...

If

A

and

C

make

30 \%

and

20 \%

of DNA, respectively, what will be the percentage composition of

\mathrm{T}

and

\mathrm{G}

?

Options

A $\mathrm{T}: 20 \%, \mathrm{G}: 30 \%$
B $\mathrm{T}: 30 \%, \mathrm{G}: 20 \%$
C $\mathrm{T}: 30 \%, \mathrm{G}: 30 \%$
D $\mathrm{T}: 20 \%, \mathrm{G}: 20 \%$

Correct answer

B. $\mathrm{T}: 30 \%, \mathrm{G}: 20 \%$

Step-by-step solution

\begin{aligned}& \mathrm{A} \rightarrow30 \%=\mathrm{T} \rightarrow30 \% \\ & \mathrm{C} \rightarrow20 \%=\mathrm{G} \rightarrow20 \% \end{aligned}

According

to chargaff's rule, Adenine (A) pairs with Thymine (T) and Cytosine (C) pairs with Guanine (G). So, The ds DNA have equal percentage of A and T or G and C

.

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