The following ratio is generally constant for a given species:
The following ratio is generally constant for a given species:
$\mathrm{A}+\mathrm{G} / \mathrm{C}+\mathrm{T}$
$\mathrm{T}+\mathrm{C} / \mathrm{G}+\mathrm{A}$
$\mathrm{G}+\mathrm{C} / \mathrm{A}+\mathrm{T}$
$\mathrm{A}+\mathrm{C} / \mathrm{T}+\mathrm{G}$.
Solution
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., $A=T ; C=G$