Genetic Drift

Multiple Choice

Why do you think the concept of 'survival of the fittest' is important in biology?

• Because it explains why only the strongest survive in every situation

• Because it helps us understand how species adapt and evolve over time

• Because it means only physically fit individuals survive

• Because it is the only mechanism of evolution

Open Ended

What are some possible effects of genetic drift on a small population?

Multiple Select

Which of the following are examples of physical barriers that can cause geographic isolation?

• Mountains

• Oceans

• Roads

• Wind

Open Ended

Explain how geographic isolation can lead to the formation of new species. Use examples of physical barriers in your answer.

Multiple Choice

What is the main difference between natural selection and genetic drift?

• Natural selection is driven by fitness, while genetic drift is random.

• Genetic drift is caused by human intervention, while natural selection is not.

• Natural selection decreases genetic variation, while genetic drift increases it.

• Genetic drift only occurs in large populations.

Multiple Choice

Which of the following best describes genetic drift?

• A change in a population’s gene pool due to random chance

• The selection of traits by humans for breeding

• The separation of populations by a physical barrier

• The increase in fitness due to natural selection

Multiple Choice

Which of the following factors plays the largest role in genetic drift?

• random chance

• artificial selection

• human intervention

• natural selection

Open Ended

Explain how the founder effect can lead to a new population with different allele frequencies than the original population.

Multiple Choice

What will most likely happen in the future in the new population?

• Some yellow beetles will travel to find the new population.

• An allele for a new color will develop to replace yellow.

• The new population's offspring will contain mostly blue and green beetles.

• Half of the beetles will turn yellow before reproducing.

Open Ended

Compare and contrast the founder effect and the bottleneck effect in terms of their causes and consequences for genetic diversity.

Multiple Choice

Which of the following events can cause a bottleneck effect in a population?

• fire

• migration

• mutation

• competition

Multiple Choice

Which of these is an example of the bottleneck effect?

• A small population of butterflies is blown into another forest.

• One species of bird evolves into several different species on different islands.

• A farmer breeds only the cows that produce the most milk.

• A volcanic eruption kills all but 25 pigs on an island.

Open Ended

Explain how the American Bison population demonstrates the bottleneck effect and its impact on genetic diversity.

Open Ended

What is genetic drift and how does it differ from natural selection?

Open Ended

Why is extinction more probable in the event of the bottleneck effect?

Multiple Select

Which of the smaller populations can result from the founder effect? Select ALL that apply.

• Population 1

• Population 2

• Population 3

• None of the above

Multiple Select

Which of the smaller populations can result from the founder effect?

• Population 1

• Population 2

• Population 3

• None of the above

Multiple Choice

Which statement best explains how geographic isolation relates to speciation?

• Geographic isolation prevents populations from breeding.

• Geographic isolation leads to random changes in gene pools.

• Geographic isolation causes genetic changes in populations that interact.

• Geographic isolation encourages different species to interbreed.

Open Ended

Explain how both the founder effect and bottleneck effect can influence genetic diversity in a population.

Open Ended

What questions do you still have about genetic drift, or is there anything you would like to know more about this topic?

Open Ended

How does the concept of 'survival of the fittest' relate to natural selection, and what are some ways this idea might impact how we think about our own habits or behaviors?