Otters and the Bottleneck Effect - Amplify

What is the primary function of the thick fur of sea otters as mentioned in the text?

• To help them swim faster

• To keep them warm and dry in cold ocean water

• To make them look larger to predators

• To help them catch fish more easily

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What does the "bottleneck effect" refer to in genetic terms?

• A method of tracking genetic changes over time

• A situation where a population's size increases suddenly

• A genetic scenario where a population's size decreases suddenly, usually due to an external event, leading to reduced genetic variation

• A process where new genes are introduced into a population

How did the sea otter population change by 1911 due to human activities?

• The population increased to over 100,000

• The population decreased to about 2,000 otters

• The population remained stable with no significant changes

• The population expanded into new oceanic territories

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As of the time the text was written, how has the sea otter population recovered?

• It has decreased further due to ongoing hunting

• It has remained the same as in 1911

• It has increased to more than 100,000 otters

• It has stabilized but with significant genetic issues

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What is a genetic bottleneck?

• A process where a large population becomes very small, leading to a decrease in genetic variation.

• An increase in population size after a natural disaster.

• A method by which animals adapt to new environments.

• A technique used by scientists to increase genetic diversity.

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What happens to the variety of genes in a species after a bottleneck event?

• It increases significantly.

• It remains the same.

• It decreases.

• It varies depending on the species.

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Why might sea otters be less likely to adapt to future environmental changes?

• They have a large variety of genes.

• They are not affected by bottleneck events.

• They have fewer adaptive traits due to a past bottleneck event.

• They are widely spread across different environments.

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What is the significance of the otters' fur according to the text?

• It is not very valuable.

• It helps them to swim faster.

• It has led to their hunting due to its appeal.

• It changes color with the environment.

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What is the likely outcome for a species that has gone through a bottleneck event and is now endangered?

• It will quickly regain its original population size.

• It will have less genetic variation than before the bottleneck.

• It will become immune to future bottlenecks.

• It will not be able to survive in the wild anymore.

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