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Q. In DNA $20\%$ bases are adenine. What percentage of bases are pyrimidines?

Molecular Basis of Inheritance

Solution:

The percentage of bases which are pyrimidines is
$50\%$. According to Chargaff s rule
$A + G= C+ T= 50\%$
(Purines) (Pyramidines)
$ \therefore \,A = 20\%,$ then $T= 20\%$
$C+ T = 50\%$
$C= 50\% - 20\%= 30\%$
Total percentage of pyrimidine bases
$(T + C)$ are $20+ 30= 50\%$