Natural Selection

Front

Necessary condition for changes in finch populations due to drier climate and beak shape adaptation: fewer mutations, limited food resources, limited beak variations, overproduction of offspring.

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limited food resources

Front

Which factor has the least effect on natural selection in a geographically isolated subspecies of giraffes? Options: available niches, existing predators, chromosome number, available food resources.

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chromosome number

Front

Mutations within a DNA sequence are:

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natural processes that produce genetic diversity

Front

Which of the following best illustrates natural selection? Options: An organism with favorable genetic variations will tend to survive and breed successfully. , A population monopolizes all of the resources in its habitat, forcing other species to migrate., A community whose members work together utilizing all existing resources and migratory routes., The largest organisms in a species receive the only breeding opportunities.

Back

An organism with favorable genetic variations will tend to survive and breed successfully. 

Front

How will genetic drift probably affect a small population of chimpanzees in an unchanging habitat?

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It will reduce genetic diversity.

Front

A small portion of the population that is geographically isolated from the rest of the population runs the risk of decreased.

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genetic drift

Front

Which of the following is NOT part of Darwin's observations on natural selection? Options: Organisms produce more offspring than can survive, Disease and natural disaster will limit population growth, Species today descended with modifications from ancestral species, Organisms with advantages will survive and reproduce.

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Species today descended with modifications from ancestral species.

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Theodosius Dobzhansky discovered that successful species tend to have a wide variety of genes that do not appear to be useful to the species in its present environment. What did this discovery help explain about genetics and the changes that occur in a species over time?

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Species with greater genetic diversity adapt more easily to changing environments.

Front

Process responsible for increased size, strength, and speed in horses over 50 million years?

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evolution by natural selection

Front

Survival of at least a few members of a population after a major environmental change is most dependent on: the population having an individual that is adapted to the original environment, the population having an individual that is adapted to great changes in the temperature in its environment, variations in many different traits in many individuals in the population, no variations in the color of the fur, skin, or feathers of the individuals in the population.

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variations in many different traits in many individuals in the population