Biologists Often Use Schematic Diagrams to Illustrate the Regulation of Various

question 150

Multiple Choice

Biologists often use schematic diagrams to illustrate the regulation of various genes and cell signaling pathways. In these diagrams, an arrow is used to show the activation of one gene by the product of another. The inhibition of the expression of a gene by the product of another is indicated by a horizontal line with a T-shaped end. In the example here, the expression of A blocks the expression of B, while the expression of C promotes the expression of D. $A$ $B$
$\begin{array}{l}C \longrightarrow D\end{array}$ Choose the model that CORRECTLY shows the regulatory relationships between the nanos, bicoid, caudal, hunchback and Krüppel genes and gene products.

• A)model A
• B)model B
• C)model C

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