Modes of Gastrulation in Vertebrates

  title={Modes of Gastrulation in Vertebrates},
  author={Conrad Hal Waddington},
The modes of gastrulation in the different classes of Vertebrates are discussed from a comparative point of view, with the particular aim of finding some system which avoids postulating a sharp dualism between the anamniote telolecithal forms, in which the edge of the blastoderm consists of presumptive endoderm, and those of the Amniotes, in which it is ectodermal. It is suggested that the most profitable way of regarding all blastodermic forms is to envisage them as derived from the basic type… CONTINUE READING

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