Refer to the Figure

question 8

Multiple Choice

Refer to the figure.
The figures show the distribution of beak sizes in Galápagos medium ground finches (Geospiza fortis) before and after a year of extreme drought that reduced the availability of seed types most easily accessed by birds with pre-drought bills. Which of the following statements is true?

• A) Between 1976 and 1978, mean beak depth increased by approximately 30%, which is an example of disruptive selection.
• B) Between 1976 and 1978, mean beak depth increased by approximately 10%, which is an example of directional selection.
• C) Between 1976 and 1978, mean beak depth increased by approximately 10%, which is an example of stabilizing selection.
• D) Between 1976 and 1978, mean beak depth did not change significantly, but variance increased, as expected for disruptive selection.

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Definitions:

Basket

A collection or group of items or financial assets that are considered as a single unit for purchase, sale, or analysis.

CPI

The Consumer Price Index, a measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care.

Purchasing Power

How much a single unit of money can purchase in terms of goods or services, indicating the currency's value.

CPI

The Consumer Price Index (CPI) measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.