Homology and molecular homology
Answers
Homology:
In biology, homology is the existence of shared ancestry between a pair of structures, or genes, in different taxa. A common example of homologous structures is the forelimbs of vertebrates, where the wings of bats, the arms of primates, the front flippers of whales and the forelegs of dogs and horses are all derived from the same ancestral tetrapod structure. Evolutionary biology explains homologous structures adapted to different purposes as the result of descent with modification from a common ancestor
Molecular Homology:
Molecular Homology. The deepest level of homology: The molecules that carry the instructions for making and running our bodies, encoded in our DNA. The evolutionary history of a species can be seen in its DNA sequences. The more closely related two species are, the more similar their DNA sequences.