Population Genetics

Why is genetic drift not a type of natural selection?

• It's random; not due to advantages that the individual has

• It's due to the environment, rather than chromosomal changes

• Humans are involved, making genetic drift artificial selection

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What is the only way to create brand new alleles in an isolated population?

• Mutation

• Natural selection

• Genetic drift

• Nonrandom mating

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In order to have sexual selection occur, which of these must happen?

• Nonrandom mating

• Genetic drift

• Gene flow

• Nondisjunction

• Binary fission

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Male peacocks have beautiful blue and green plumage. However, this coloration makes them easier for tigers to hunt and kill. Why might they have these colors?

• Sexual preference by female peacocks

• Genetic drift randomly killed off all brown peacocks

• Peacocks mated with parrots a long time ago

• There is no reason - it's a horrible mutation with no advantage

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A volcano explodes and destroys half of an island. Any creature that happened to be on the north part of the island is now dead. This has changed the allele frequencies randomly. This is probably...

• Genetic drift

• Gene flow

• Natural selection

• Volcanic mutation

Which of these can change allele frequencies in a population?

• Sexual selection

• Genetic drift

• Gene flow

• Natural selection

• All of these can change allele frequencies

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If the allele for long fur gives individuals an advantage, what is likely to occur over time?

• The frequency of that allele will increase

• The frequency of that allele with decrease

• Mutations can no longer affect that gene

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What is this image depicting?

• Gene flow

• Nonrandom mating

• Genetic drift

• Sexual selection

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Temperatures start rising in an environment with rabbits. What is a reasonable prediction for what happens to the allele for long, warm fur?

• Becomes less frequent in the population

• It is mutated by the changing temperatures

• Switches to its back-up mode of scales

• Long fur individuals war with short fur individuals

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In genetic drift, the allele frequencies in a gene pool change because of

• mutations

• genetic equilibrium

• natural selection

• chance

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