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Question: Answered & Verified by Expert
The following ratio is generally constant for a given species:
BiologyEvolutionNEETNEET 2004
Options:
  • A $\mathrm{A}+\mathrm{G} / \mathrm{C}+\mathrm{T}$
  • B $\mathrm{T}+\mathrm{C} / \mathrm{G}+\mathrm{A}$
  • C $\mathrm{G}+\mathrm{C} / \mathrm{A}+\mathrm{T}$
  • D $\mathrm{A}+\mathrm{C} / \mathrm{T}+\mathrm{G}$.
Solution:
2085 Upvotes Verified Answer
The correct answer is: $\mathrm{G}+\mathrm{C} / \mathrm{A}+\mathrm{T}$
The $\mathrm{C}+\mathrm{G} / \mathrm{A}+\mathrm{T}$ ratio varies from organism to organism among the prokaryotes), but within (particularly the limits of experimental error, $\mathrm{A}=\mathrm{T}$ and $\mathrm{C}=\mathrm{G}$.
Related Theory
Erwin Chargaff discovered that the number of nitrogenous bases in the DNA was present in equal quantities. The amount of $A$ is equal to $T$, whereas the amount of $C$ is equal to $G$, i.e., $A=T ; C=G$

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