AP Biology Evolution: Chapters 22 & 23

Which of the following is a true statement about natural selection?

• it is goal directed
• individuals evolve
• variation exists in a population
• acquired characteristics

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In a population that is in Hardy-Weinberg equilibrium, the frequency of a particular recessive allele a is .4.  What is the percentage of the population heterozygous for this allele?

• 4 percent
• 16 percent
• 32 percent
• 48 percent

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variations in a population are maintained by

• mutations
• genetic recombination
• gene flow
• all of the above

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which of the following is NOT a requirement for Hardy-Weinberg equilibrium?

• small population
• no gene flow
• no mutations
• no selection

which of the following is not involved in natural selection?

• competition for resources
• differences in reproductive success
• inheritable variation in populations
• breeder selects traits

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What is suggested by the similarity of early embryos of different species of vertebrates?

• no evolutionary relationships between the groups
• recent common ancestry
• similar environments in the past
• evolution from a distant common ancestor

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If an organism has a vestigial structure, that structure likely once had a function in a(n)

• close relative
• early ancestor
• unrelated organism
• embryological stage

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Mutations are important because they bring about

• death of the organism in which they develop
• genetic variation needed for a population to evolve
• benefits for the individual, not for the population
• Hardey-Weinberg equilibrium within a population

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Which of the following is an example of gene flow?

• A subordinate wolf successfully challenges the alpha male and mates with pack females
• A deer picks up spores from a plant as it grazes and deposits them next to that plant.
• A young stallion is driven out of its herd by the alpha stallion and begins its own herd in another location
• All of these answers

A migratory bird unknowingly accumulates a few seeds of the hwagha plant in her feathers and drops them in an area where those plants did not live before.  This is an example of

• Founder Effect
• Predation
• Bottleneck Effect
• Migration

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