Similar DNA sequences in genes can be evidence of

A) Binomial nomenclature.

B) Mutations.

C) Common ancestry.

D) Different anatomy.

Similar DNA sequences in genes can be evidence of C) Common ancestry.

All organisms have evolved from a common ancestor due to the accumulation of variations. In order for these variations to be passed on from one generation to the other, these should be heritable, i.e, these variations should be present in the genetic material of the organism; for most organisms, the genetic material is DNA. Hence, a high degree of similarity between two organisms indicates that they are closely related species that evolved from a common ancestor. This is the principle behind molecular phylogenetic studies that trace the ancestral relationship between different species based on DNA sequence similarities.

For e.g, the 16SrRNA gene in prokaryotes and the CO1 gene in eukaryotes is commonly used for phylogenetic studies and understanding the degree of relatedness among different species.