Analysis of dna sequences from two individuals of the same species results in a greater estimate of genetic variability than does analysis of amino acid sequences from the same individuals because

If we will perform the DNA (genome) and amino acid sequence (proteome) of the two individuals belonging to the same species, then there are chances that a high percentage of the variability will be observed compared to the proteome sequence.

This could be accounted to the fact that in an organism only twenty-two amino acids are known which are encoded by the nucleotide bases when counted in triplets called codons. The codons are specific to amino acid but more than one codon can code for the same or single amino acid.

This shows that if the DNA sequence varies, the amino acid sequence will not vary to the same extent.