Embryonic recapitulation, coenogenesis and heterochrony. An attempt at a comparative analysis of the relationships between embryogenesis and evolution.
The relationships between embryogenesis and the scale of living beings have been the subject of long-dated observations. It is well known that Haeckel, going back and codifying this data, has divided it into two large groups called palingenesis and coenogenesis. He has only mentioned the concept of heterochrony to which we give much more importance nowadays. We will look over these questions and link them up with some aspects of modern genetics.
Delsol
M
M
Laboratoire de Biologie Générale, Faculté Catholique des Sciences de Lyon, France.
Flatin
J
J
D000818:Animals; D005075:Biological Evolution; D004626:Embryology; D005823:Genetics; D008675:Metamorphosis, Biological