Raven Starr Biology Ch20 Genes Within Populations

What does the image represent?

• Founder effect

• Bottleneck effect

• Natural Selection

• Mutations

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During a biology class, Mark and Amelia were discussing how mutations affect the formation of new species. What role do mutations play in the process of speciation?

• They eliminate genetic diversity

• They introduce new genetic variations

• They prevent species from adapting

• They always lead to extinction

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Why are advantageous traits more likely to be passed onto offspring?

• Because they are more likely to survive and reproduce.

• Because they come from dominant alleles.

• Because they come from recessive alleles.

• Because the organism knew it needed that trait, survives, and passes it on.

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What impact did the introduction of new genetic material from Texas panthers have on the Florida panther population?

• It decreased the genetic diversity of the population

• It increased the genetic diversity of the population

• It led to a decline in the overall health of the panthers

• It caused the extinction of the Florida panthers

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Why is genetic variability important to the health of populations and preventing extinction? Consider a scenario where Cayden and Khalila are studying a population of animals in a rapidly changing environment.

• It ensures that all individuals are identical

• It reduces the chances of disease spreading

• It allows populations to adapt to changing environments

• It limits the potential for evolution

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Speciation can occur as a result of geographic isolation because _________.

• members of a species can no longer find mates

• populations that live in different environments may be exposed to different selection pressures

• exchange of genes during recombination

• movement of genes within a population because of interbreeding

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_______________ occurs when a population declines to a very small number then goes back up but results in a permanent loss of genetic diversity in the population (example: the Cheetah population)

• coevolution

• bottleneck

• archaeopteryz

• mutation

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What is the primary mechanism by which genetic variation is introduced into a population?

• Mutation

• Natural selection

• Genetic drift

• Gene flow

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How does genetic drift affect small populations differently than large populations?

• It has a greater impact on small populations

• It affects all populations equally

• It only affects large populations

• It has no impact on small populations

Which of the following is an example of a bottleneck effect?

• A natural disaster drastically reduces a population's size

• A new mutation spreads through a population

• A population migrates to a new habitat

• Two populations merge into one

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