The acrosome reaction, exposes the inner acrosomal membrane to the outside. The junction between this inner acrosomal membrane and the sperm cell membrane is called the equatorial region, and this is where membrane fusion between sperm and egg begins

TLS Online TPP Program

#Id: 7395

#Unit 5. Developmental Biology

Oocyte nucleus travels to anterior dorsal side of oocyte where it localizes gurken mRNA

TLS Online TPP Program

#Id: 7396

#Unit 5. Developmental Biology

Translated Gurken is received by Torpedo proteins. Torpedo signal causes follicle cells to differentiate to a dorsal morphology.

Gurken does not diffuse to ventral

follicle cells

TLS Online TPP Program

#Id: 7397

#Unit 5. Developmental Biology

Pipe synthesis is inhibited in dorsal follicle cells

TLS Online TPP Program

#Id: 7398

#Unit 5. Developmental Biology

Ventral follicle cells synthesize Pipe. Pipe signal sulfates ventral vitelline proteins

TLS Online TPP Program

#Id: 7399

#Unit 5. Developmental Biology

Sulfated vitelline membrane proteins bind Gastrulation-defective.

TLS Online TPP Program

#Id: 7400

#Unit 5. Developmental Biology

GD cleaves Snake to its active form and forms a complex with Snake and uncleaved Easter proteins.

Easter protein is cleaved into its

active form.