Branching of the Drosophila Tracheal System Involves Three Genes,Branchless,Breathless,and Sprouty,and

question 7

Multiple Choice

Branching of the Drosophila tracheal system involves three genes,Branchless,Breathless,and Sprouty,and orthologs of these genes play similar roles in vertebrate lung development.What would be the expected outcome if Sprouty is inactivated during Drosophila development?

• A) The tracheal system fails to form.
• B) Extra branching of the tracheal system occurs.
• C) Less branching of the tracheal system occurs.
• D) The tracheal system is converted into a nervous system.
• E) The tracheal system is converted into muscle.

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Definitions:

Fixed Cost

A financial outlay that is unaffected by variations in the production or sales levels of goods and services.

Marginal Cost

The expense associated with creating an extra unit of a product or service.

Total Cost

The complete cost of producing a specific quantity of output, including both fixed and variable costs.

Output

The total amount of goods or services produced by a company, industry, or economy within a certain period.