Scenario Over the Past 60 Years, Many Amphibian Species Have Experienced

question 46

Multiple Choice

Scenario
Over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. Scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. However, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. These global declines suggest widespread problems, including increased ultraviolet radiation, acid rain, and disease. In Switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction.
-When most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that ________.

• A)artificial selection becomes a greater factor in microevolution
• B)the founder effect becomes increasingly important
• C)gene flow between populations is reduced
• D)microevolution no longer occurs

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Definitions:

Nonparents

Individuals who do not have children, either by choice or circumstance.

Child-Free

Individuals or couples who choose not to have children.

Infertile

The inability to conceive a child after a year or more of regular sexual intercourse without the use of birth control.

Placenta

An organ that connects the developing fetus to the uterine wall to provide nutrients and oxygen via the mother’s bloodstream to the fetus while also removing waste products from the fetus’ blood.