Genetic Diversity and Natural Selection

Mr. Matthew discusses the importance of variation in populations, linking it to evolution and natural selection. He explains how genetic diversity allows populations to adapt to environmental pressures, using examples like the rock pocket mice. The video highlights the impact of population size on genetic diversity and the risk of extinction. It also covers how adaptive alleles may be beneficial in one environment but not in another, emphasizing the role of genetic variation in survival.

What is the relationship between variation in populations and evolution?

• Variation is a key component of natural selection, which drives evolution.

• Variation only affects individual organisms, not populations.

• Variation is unrelated to evolution.

• Variation hinders the process of evolution.

How does genetic diversity help a population withstand environmental pressures?

• It makes the population more susceptible to diseases.

• It reduces the population's ability to adapt.

• It increases the likelihood of some individuals surviving changes.

• It ensures all individuals are identical.

What happens to genetic diversity when a population becomes very small?

• Genetic diversity increases.

• Genetic diversity remains the same.

• Genetic diversity decreases, increasing extinction risk.

• Genetic diversity has no impact on small populations.

What is a potential consequence of reduced genetic diversity in endangered species?

• Increased resistance to diseases.

• Greater ability to adapt to environmental changes.

• Higher susceptibility to extinction.

• No impact on the species' survival.

Why is genetic diversity important for a population's adaptation to environmental changes?

• It ensures all individuals are equally affected by changes.

• It provides a range of traits that may be advantageous in new conditions.

• It prevents any adaptation to new environments.

• It makes the population more uniform.

What is an example of a trait that might be advantageous in one environment but not in another?

• A trait that is always advantageous.

• A trait that is neutral in all environments.

• A trait that is disadvantageous in all environments.

• A trait that is adaptive in one environment but deleterious in another.

How can genetic diversity affect a population's response to a novel disease?

• It ensures all individuals are equally affected.

• It increases the chance that some individuals have resistance.

• It makes the population more vulnerable.

• It has no effect on disease resistance.

How do the rock pocket mice demonstrate the concept of selective pressure?

• They show that all mice are equally adapted to any environment.

• They illustrate how different environments favor different traits.

• They indicate that selective pressure is not influenced by environment.

• They prove that only dark-colored mice can survive.

What happens to dark-colored mice when placed on light brown soil?

• They are easily spotted and selected against by predators.

• They change color to blend in.

• They become invisible to predators.

• They thrive better than on dark lava flows.

Why might a light brown mouse not survive well on a dark lava flow?

• It is immune to predation.

• It can adapt quickly to the new environment.

• It is more visible to predators and selected against.

• It blends in too well with the environment.