The range of frequencies are between 1 to 30 Hz and amplitudes will vary between 20 to 100 μV. 

TLS Online TPP Program

#Id: 1601

#Unit 5. Developmental Biology

If Wnt PCP pathway is blocked, the mesoderm and endoderm form peripherally instead of centrally.

 

TLS Online TPP Program

#Id: 1602

#Unit 5. Developmental Biology

As cells enter the primitive streak, they undergo an epithelial-to-mesenchymal transformation.

TLS Online TPP Program

#Id: 1603

#Unit 5. Developmental Biology

The elongation of the primitive streak coextensive with the anterior migration of secondary hypoblast cells, and hypoblast directs the movement of the primitive streak.

TLS Online TPP Program

#Id: 1604

#Unit 5. Developmental Biology

Amniote cell specification (germ layer identity)is established before gastrulation starts, but the specification of cell type is controlled by inductive influences during and after migration through the primitive streak.

TLS Online TPP Program

#Id: 1605

#Unit 5. Developmental Biology

Cells passing through the more anterior portions of the primitive streak give rise to the endoderm, head mesoderm, and notochord.

TLS Online TPP Program

#Id: 1606

#Unit 5. Developmental Biology

Cells passing through the more posterior portions of the primitive streak give rise to the majority of mesodermal tissues.