Pasteels $(1945)$ described gastrulation takes place in aves by

Repressor theory of activation of fertilization was given by

The blastula of prototherians is called

Vitellogenesis occurs during the formation of

Cleavage was first observed by

The mammary glands are paired structures that contain the glandular tissue and variable amount of fat. The correct sequence of tissues involved in synthesis and flow of milk are