What Is the Correct Order of Steps of Morphogenesis in Drosophila

question 35

Multiple Choice

What is the correct order of steps of morphogenesis in Drosophila melanogaster?
A. Gap genes divide the body into broad regions
B. Establishment of anterior / posterior axes
C. Homeotic genes determine which body parts arise from each region
D. Pair-rule genes are activated in order to develop a preliminary segmentation pattern

• A) b - a - d - c
• B) a - d - c - b
• C) b - a - c - d
• D) a - b - c - d
• E) a - d - b - c

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Definitions:

Equilibrium Price

The price at which the quantity of a good or service demanded equals the quantity supplied, leading to a state of balance in the market.

Equilibrium Quantity

The amount of goods or services supplied that is exactly equal to the amount of goods or services demanded at a particular price level.

Demand

The total amount of a product or service that consumers are willing and able to purchase at various price levels at a given time.

Price Range

The spread between the highest and lowest prices of goods or services in the market.