Monomeric Ras protein 

(∼170 amino acids) belongs to the GTPase superfamily of

intracellular switch proteins

TLS Online TPP Program

#Id: 7373

#Unit 5. Developmental Biology

At the same time, the protein products of the gap, pair-rule, and segment polarity genes interact to regulate another class of genes, the homeotic selector genes, whose transcription determines the developmental fate of each segment

TLS Online TPP Program

#Id: 7374

#Unit 5. Developmental Biology

Gurken protein is a member of the EGF (epidermal growth factor) family, and Torpedo encodes a homologue of the vertebrate EGF receptor.

TLS Online TPP Program

#Id: 7375

#Unit 5. Developmental Biology

When Gurken binds to Torpedo, the terminal follicle cells differentiate into posterior follicle cells and synthesize a molecule that activates protein kinase A in the egg.

TLS Online TPP Program

#Id: 7376

#Unit 5. Developmental Biology

Par-1 protein organizes microtubules specifically with their minus and plus ends at the anterior and posterior ends of the oocyte, respectively

TLS Online TPP Program

#Id: 7377

#Unit 5. Developmental Biology

Bicoid mRNA binds to dynein, a “minus-directed” motor protein associated with the nongrowing end of microtubules; dynein moves the bicoid mRNA to the anterior end of the egg. 

TLS Online TPP Program

#Id: 7378

#Unit 5. Developmental Biology

Par-1 protein organizes microtubules specifically with their minus and plus ends at the anterior and posterior ends of the oocyte, respectively