# NEET Botany Molecular Basis of Inheritance Questions Solved

If 4 types of nitrogenous bases are present in nucleic acid , genetic code pentaplet.
What is the possible number of base substitutions in total codon?
(A)15360
(B)960
(C)1024
(D)256

solution-
If a genetic code is pentaplet, then total codons will be 4*4*4*4*4=1024
In a pentaplet codon a single nitrogenous base can be substituted with 3 nitrogenous bases so a total of 15 substitutions are possible in the pentaplet.
So for 1024
1024*15=15360 base substitutions are possible.

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