DnaA-ATP in an extended multimeric state promoted by the accessory protein DiaA, which stimulates cooperative binding of DnaA.

DnaA-ATP binds cooperatively to form a helical central core around which oriC DNA is wrapped.

TLS Online TPP Program

#Id: 7362

#Unit 5. Developmental Biology

In the presence of Nodal, the Pitx2 gene is activated

TLS Online TPP Program

#Id: 7363

#Unit 5. Developmental Biology

On the right side of the embryo, activin is expressed, along with activin receptor IIa. This activates Fgf8, a protein that blocks expression of the gene for Cerberus.

TLS Online TPP Program

#Id: 7364

#Unit 5. Developmental Biology

In the absence of Cerberus, Nodal is not activated and thus Pitx2 is not expressed

TLS Online TPP Program

#Id: 7365

#Unit 5. Developmental Biology

Drosophila eggs undergo Superficial cleavage.

TLS Online TPP Program

#Id: 7366

#Unit 5. Developmental Biology

In the Drosophila egg, karyokinesis occurs without cytokinesis to create a syncytium.

TLS Online TPP Program

#Id: 7367

#Unit 5. Developmental Biology

In Drosophila, during the ninth division cycle- Pole cells determination