5.14 Crash Course Video: Natural Selection

What is natural selection?

• Natural selection is the method by which all organisms are equally likely to survive.
• Natural selection is the phenomenon where only the strongest individuals survive regardless of their environment.
• Natural selection is the process by which organisms that are better adapted to their environment tend to survive and reproduce more successfully.

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What is the difference between genotype and phenotype?

• Genotype is the environmental influence, while phenotype is the inherited traits.
• Genotype refers to the physical appearance, while phenotype is the genetic makeup.
• Genotype is the genetic constitution, while phenotype is the expressed traits.

Why is variation important for natural selection?

• Variation enables some individuals to survive and reproduce better than others, leading to evolutionary change.

• Variation leads to uniformity in species.
• Variation decreases the chances of evolutionary change.

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What does Dr. Sammy mean by "selected for" and "selected against" in terms of the white deer and the green/brown deer?

• 'Selected for' refers to traits that enhance survival, while 'selected against' refers to traits that hinder survival.
• 'Selected for' means traits that are harmful, while 'selected against' means traits that are beneficial.
• 'Selected for' indicates traits that are irrelevant, while 'selected against' indicates traits that are essential.

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How did the species of anoles adapt over time to survive hurricane season?

• Anoles developed larger body sizes to withstand strong winds.
• Anoles migrated to higher ground before hurricanes.
• Anoles developed stronger grips, increased agility, and behavioral changes to survive hurricanes.

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What is stabilizing selection?

• Stabilizing selection promotes extreme traits in a population.
• Stabilizing selection favors average traits and reduces variation in a population.

• Stabilizing selection is a process that eliminates all traits except the most advantageous.

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What is directional selection?

• Directional selection favors one extreme trait, causing a shift in the population's characteristics.

• Directional selection occurs when all traits in a population are equally favored, leading to stability.
• Directional selection is a type of genetic drift that randomizes traits in a population.

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What is disruptive selection?

• Disruptive selection occurs when a population stabilizes around average traits.
• Disruptive selection is a type of genetic drift that eliminates all traits in a population.
• Disruptive selection favors extreme traits in a population.

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What is the difference between natural selection and artificial selection?

• Natural selection is a process that only occurs in domesticated animals, while artificial selection happens without any human intervention.

• Natural selection occurs naturally through environmental pressures, while artificial selection is human-directed breeding for specific traits.

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What is one thing you learned or found interesting from the video?

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