Refer to the Figure, Which Shows a Phylogenetic Tree of the Engrailed

question 20

Multiple Choice

Refer to the figure, which shows a phylogenetic tree of the engrailed gene family. In the evolution timeline, which gene is the most recent paralog of zebrafish En2b?

• A) Zebrafish En2a
• B) Chicken En2
• C) Lamprey En
• D) Sea urchin En
• E) Human En1

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Definitions:

Mixed Cost

A cost consisting of both fixed and variable components, changing in total with the level of activity but remaining constant on a per unit basis only up to a certain level of activity.

Activity

A measure of actions or operations within a process, often used to allocate costs in activity-based costing.

Per Unit

A term referring to the cost, price, or quantity related to one unit of a product or service.

Contribution Margin

The difference between sales revenue and variable costs, indicating how much revenue contributes towards covering fixed costs and generating profit.