A Researcher Returns from the Amazon River with 10 Individuals

question 17

Multiple Choice

A researcher returns from the Amazon River with 10 individuals of a species of fish and establishes a small breeding colony in her laboratory. She maintains the colony for several years (many fish generations) , always maintaining the number of adult fish between 10 and 30. She notices that as generations of fish are bred, the reproductive rate decreases. What is the most likely reason for this?

• A) inbreeding depression
• B) increased genetic variability
• C) random mutations
• D) heterozygote advantage

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Definitions:

Binge Drinkers

Individuals who consume large amounts of alcohol in a short period of time, typically defined as five or more drinks for men and four or more drinks for women in about two hours.

Heavy Drinkers

Individuals who consume alcoholic beverages in amounts that exceed the standard guidelines for moderate drinking.

Temperance Movement

A social movement against the consumption of alcoholic beverages, aiming for moderation or complete abstinence.

18th Amendment

An amendment to the U.S. Constitution prohibiting the manufacture, sale, and transportation of alcoholic beverages; later repealed by the 21st Amendment.