D.N.A.(Deoxyribonucleic acid) is the genetic material

found in the chromosomes of all animals and plants.

It is made up of only 4 types of organic  nitrogenous bases:

A(adenine),G(guanine),T(thymine) and C(cytosine).

Of these, A and G  are the purines and T and C are the

pyrimidines. Chargaff  said that only one purine can

combine with one pyrimidine(A with T and G with C).

Two  purines or two pyrimidines cannot combine with

each other; if they do so, there will be a sudden change

in the characteristic of an organism. This sudden change

is called mutation.



One thought on “Mutation

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