EVERYDAY SCIENCE

Detailed explanation-1: -But for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that’s the instruction manual for building each species. Humans and chimps share a surprising 98.8 percent of their DNA.

Detailed explanation-2: -Scientists can compare the DNA of two organisms; the more similar the DNA, the more closely related the organisms. This method can also help when looks are deceptive.

Detailed explanation-3: -Organisms that share similar physical features and genetic sequences tend to be more closely related than those that do not. Features that overlap both morphologically and genetically are referred to as homologous structures; the similarities stem from common evolutionary paths.

Detailed explanation-4: -Generally, species that are closely related have high degree of similarity in DNA sequences when compared nucleotide by nucleotide. This is because the species originally shared the same DNA sequence, a recent evolutionary divergence leaves little time for differences to accumulate between the two sequences.