biological principle, formulated about 1890 by Louis Dollo, a French-born Belgian paleontologist, that evolution is not reversible; i.e., structures or functions discarded during the course of evolution do not reappear in a given line of organisms. The hypothesis was first advanced by a historian, Edgar Quinet.
DOLLO'S LAW
Meaning of DOLLO'S LAW in English
Britannica English vocabulary. Английский словарь Британика. 2012