Evolution & Natural Selection

Which of the following is NOT a mechanism of evolution?

• Natural selection

• Gene flow

• Genetic drift

• Crossing over

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What is shown in the image above?

• Homologous structures

• Vestigial structures

• Analogous structures

• Embryological structures

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When genetic drift occurs in a ____________________ population, it can lead to ___________________ in genetic diversity.

• Large; increases

• Small; increases

• Large; decreases

• Small; decreases

Over a relatively short amount of time, a population of mosquitos exposed to the pesticide DDT have adapted to their environment. Before, DDT-resistant mosquitos made up only 20% of the total population. Now, DDT-resistant mosquitos make up 100% of the total population. Which line of evidence for evolution is described above?

• Direct observation

• Embryological evidence

• Fossil evidence

• Molecular biology

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Organisms that exhibit structures that appear similar in function but do not share a recent common ancestor are said to have...

• Homologous structures

• Vestigial structures

• Embryological structures

• Analogous structures

Within the process of DNA fingerprinting, _________________ is used to amplify a same of DNA.

• Gel electrophoresis

• PCR (polymerase chain reaction)

• Sample collection

• Cloning

Certain species of snakes will produce venom to kill/harm their prey. Which type of adaptation is this an example of?

• Physical

• Physiological

• Behavioral

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Over time, it was more beneficial for horses to have larger bodies and longer legs. Looking at the fossil record, we can see that horses have increased in size. Which pattern of natural selection does this best illustration?

• Stabilizing selection

• Directional selection

• Disruptive selection

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Due to human hunting of rhinos, their population has decreased dramatically and the allele frequencies within their population have shifted. Similar to what happens with a natural disaster, this is an example of...

• Gene flow

• Mutation

• Founder's effect

• Bottleneck effect

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Emigration and immigration are examples of...

• Genetic drift

• Gene flow

• Mutation

• Natural selection

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