Shh Signaling Is Essential for Normal Patterning of the Digits

question 14

Multiple Choice

Shh signaling is essential for normal patterning of the digits.Fate labeling studies have shown that the digits are patterned by a combination of the dose,diffusion,and length of exposure to Shh signaling.Which digit is dependent solely on diffusion of Shh for its development?

• A) Digit 1, the most anterior (cranial) digit
• B) Digit 2
• C) Digit 3
• D) Digit 4
• E) Digit 5, the most posterior (caudal) digit

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Definitions:

Contagion Theory

A sociological perspective that suggests ideas, behavior, and attitudes spread through populations like diseases.

Solidarity Theory

A social and political theory that emphasizes unity or agreement of feeling or action, especially among individuals with a common interest; mutual support within a group.

Symbolic Interactionism

A sociological perspective focusing on the ways in which individuals interpret and give meaning to the world through symbolic interactions.

Resource Mobilization Theory

A theory in social movements indicating that the success of social movements depends on resources such as money, labor, and the social organization of these resources.