Point mutation involves
(2) change in single base pair
(2) The point mutations involve alterations in the structure of gene by altering the structure of DNA. Point mutations are of two types – (i) base pair substitution and (ii) frameshift substitution.
Insertion is the addition of one or more nitrogenous bases to a nucleotide chain.
Duplication is the presence of one block of genes more than once in a haploid component.
Deletion is the removal of one or more nitrogenous bases from a nucleotide chain.