Question

What difference we can see in DNA of two persons

Answer 1

differences lies in the base sequence of codons of gene(DNA)

Answer 2

Hi buddy..

Everyone’s DNA is different because everyone gets a random mix of the genes from their mother and father, and that random mix is never the same.

Even identical twins have tiny differences in their DNA, because during our development and lifetime we all get a few tiny mutations and those are different in different people.

Single nucleotide polymorphisms occur frequently throughout our DNA. They are point mutations where a single nucleotide has been changed. A majority are silent mutations and have no effect.
Some of these mutations do have effects however, and can vary from causing differences in height to eye color to increasing risk for particular diseases.