Natural Selection

The theory of ____________ explains that organisms with traits best suited to their environment have a survival advantage.

• embryology

• natural selection

• endosymbiosis

• biogenesis

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Which of the following best explains how genetic variation occurs?

• DNA mutations

• learned adaptations

• asexual reproduction

• gradualism

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Why have antibiotics become less effective against harmful tuberculosis bacteria over time?

• We have have adapted to the presence of bacteria, causing antibiotics to be less effective.

• Any bacteria with mutations protecting them from the antibiotics were more likely to live and pass on the mutations.

• The bacteria has learned to avoid the antibiotics within the human body.

• The anibiotics have become weaker over time

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Which of the following terms is referred to as the transfer of alleles or genes from one population to another?

• Gene flow

• Adaptive radiation

• Decent with modification

• Founder effect

Which of the following explains how natural selection causes a trait to become predominant in a population?

• Individuals with variations that are favorable to the environment reproduce more.

• Traits of an individual change in order to adapt to the environment.

• organisms select which traits they wish to inherit

• organisms learn new skills to adapt to the environment

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A genetic change in a trait or characteristic that increases an organism’s ability to survive and reproduce.

• extinction

• natural selection

• adaptation

• evolution

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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 trait is an acquired phenotype.

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Why do frogs and other organism produce so many eggs or offspring?

• Overproduction guarantees a survival advantage

• Overproduction ensures that at least some offspring will survive

• Overproduction ensures that all offspring will have the same adaptations

• Overproduction results in less competition for resources

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Do organisms "decide" to evolve and change?

• Yes, they know they need to change to survive

• No, they change because of random DNA mutations that are passed on by natural selection

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The differences among a species, like different bird beaks, explains which principle of natural selection?

• Overproduction

• Variation

• Selection

• Competition

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