Why Has Cystic Fibrosis Persisted at Such a High Percentage

question 107

Multiple Choice

Why has cystic fibrosis persisted at such a high percentage in some populations?

• A) affected individuals reproduce before the disease is fatal
• B) there is an advantage to being a carrier
• C) recessives have a higher fitness than dominants
• D) it is an easily treated disease
• E) the symptoms disappear in early adulthood

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Definitions:

Relevant Range

The range of activity within which assumptions about variable and fixed cost behaviors are valid.

Gross Margin

A company's net sales revenue minus its cost of goods sold (COGS), expressed as a percentage. It reveals how much profit a company makes before expenses.

Relevant Range

The range of activity within which the assumptions about fixed and variable cost behaviors hold true.

Fixed Manufacturing Cost

Costs that do not vary with the level of production, such as rent, salaries of permanent employees, and depreciation of factory equipment.