Survival of the Fittest

Organisms with the most beneficial traits will survive.  This is commonly known as

• theory of evolution.

• variations.

• survival of the fittest.

• ecosystems.

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Where the better adapted organisms survive to pass traits along to offspring.

• Evolution

• Natural Selection

• Extinction

• Artifical Selection

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A population of rabbits grows rapidly from one year to the next. Then one year, a disease strikes approximately one fourth of the adult rabbits. The disease remains with the population in the years that follow. As explained by Darwin’s theory, which of these conditions allows the rabbit population to evolve by natural selection?

• The disease affects adult and juvenile rabbits equally.

• The disease reduces the ability of the rabbits to reproduce.

• Some rabbits are resistant to the disease, and they pass the resistance to their offspring.

• No rabbits are resistant to the disease, and all die when the disease strikes them.

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The figure shows how natural selection of a single-trait gene affects lizard survival. Which of the following most likely causes the changes in allele distribution?

• The allele for light gray coloration disappears from the population. This may be because light gray lizards are more visible to predators and therefore they might be less likely to survive and reproduce.

• The allele for black coloration decreases fitness and becomes less common. This may be because black coloration keeps the lizards cool during hot summer temperatures.

• Medium gray coloration in lizards appears to be a neutral mutant allele that allows the lizards to hide better from predators. This leads to increases in phenotype and allele frequency of gray coloration.

• Because black and medium gray lizards are less visible to predators, these alleles are neutral to natural selection and therefore will not disappear from the population of lizards.

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Process by which individuals that are better suited to their environment survive and reproduce most successfully

• Natural Selection

• Extinction

• Derived trait

• Artificial Selection

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Organisms with the most beneficial traits will survive.  This is commonly known as

(a)  

• survival of the fittest.

• artificial selection

• competition

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Cheetahs that can run fast and catch prey are able to survive and reproduce successfully. Slower cheetahs don't catch as much prey and they die before they are able to reproduce. This is an example of

• Natural selection

• Extinction

• Competition

• Symbiosis

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Natural Selection is driven by a change in the environment and survival of the

• Earth

• Fastest

• Fittest

• Biggest

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Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection.

• Survival of the Fittest

• Extinction

• Derived trait

• Artificial Selection

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How does natural selection lead to evolution?

• By individuals choosing to change their characteristics

• Through random changes that happen without any reason

• By beneficial adaptations becoming more common in a population over generations

• By all members of a species evolving at the same rate

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