How Can Variation in Human Skin Color Be Used as an Example

question 8

Multiple Choice

How can variation in human skin color be used as an example of both functional and genetic adaptations?

• A)Mutations in skin cells caused by exposure to the sun produce increased genetic variation passed on to offspring.
• B)Vasodilation and vasoconstriction of the blood vessels under the skin adapt to the amount of sunlight.
• C)Human skin may be dark because of tanning or because of the genetically controlled production of more melanin.
• D)Individuals exposed to plentiful sunlight may at first tan but eventually develop genes that code for more melanin.

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Definitions:

GDP

Gross Domestic Product, which is the total market value of all final goods and services produced within a country in a specific period.

Real GDP

Gross Domestic Product adjusted for inflation, providing a more accurate measure of economic growth by reflecting the value of all goods and services produced at constant prices.

Deflation

A drop in the overall cost of goods and services, frequently resulting from a decrease in the availability of money or credit.

Inflation

The measurement of how swiftly the overall prices of goods and services increase, eroding the power to buy.