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Transcript 
16.2 Student Review
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Forces That Change Population Allele Frequencies
• True or False.
• The Hardy Weinberg principle states that
dominant alleles will eventually replace
recessive alleles
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Evolutionary forces can cause the
frequency of alleles in a population to
change.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Because mutation rates in nature are very
slow, mutations can only change allele
frequency over long periods of time.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele
Evolve
Frequencies
• True or False.
• Gene flow refers to the mixing of
genes due to imigration.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele
Evolve
Frequencies
• True or False.
• An example of nonrandom mating is
the self-fertilization of plants.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
True or False. Evolve
•
• The fact that females often select mates
because of various traits that the mates
possess has the effect of changing the
frequency of alleles in a population.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Genetic drift refers to a change in allele
frequency because of random
occurrences.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Large populations are more likely to
undergo genetic drift than are smaller
populations
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• An allele can increase or decrease in
frequency, depending on its effects on
survival and reproduction.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele
Evolve
Frequencies
• True or False.
• Natural selection is one of the
powerful agents of genetic change.
• A. True
• B. False
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Acts Only on Phenotypes
• Explain why natural selection does not act
directly on genes
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Acts Only on Phenotypes
• Given that people with hemophilia rarely
survive to adulthood and rarely reproduce,
why has natural selection not eliminated
hemophilia from the population?
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• A trait that is influenced by several genes
is called a
• __________________________ trait.
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• A hill shaped curve centered around an
average value is called
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• What is directional sequence?
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• What is stabilizing selection?
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Forces That Change Population Allele Frequencies
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Forces That Change Population Allele Frequencies
• True or False.
• The Hardy Weinberg principle states that
dominant alleles will eventually replace
recessive alleles
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Evolutionary forces can cause the
frequency of alleles in a population to
change.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Because mutation rates in nature are very
slow, mutations can only change allele
frequency over long periods of time.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele
Evolve
Frequencies
• True or False.
• Gene flow refers to the mixing of
genes due to imigration.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Genetic drift refers to a change in allele
frequency because of random
occurrences.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
True or False. Evolve
•
• The fact that females often select mates
because of various traits that the mates
possess has the effect of changing the
frequency of alleles in a population.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele
Evolve
Frequencies
• True or False.
• An example of nonrandom mating is
the self-fertilization of plants.
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• Large populations are more likely to
undergo genetic drift than are smaller
populations
• A. True
• B. False
•
HUMAN EVOLUTION
Homework
16-2 How Populations
Forces That Change Population Allele Frequencies
Evolve
True or False.
•
• An allele can increase or decrease in
frequency, depending on its effects on
survival and reproduction.
• A. True
• B. False
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Acts Only on Phenotypes
• Explain why natural selection does not act
directly on genes
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Acts Only on Phenotypes
• Explain why natural selection does not act
directly on genes
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Acts Only on Phenotypes
• Given that people with hemophilia rarely
survive to adulthood and rarely reproduce,
why has natural selection not eliminated
hemophilia from the population?
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• A trait that is influenced by several genes
is called a
• __________________________ trait.
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• A hill shaped curve centered around an
average value is called
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• What is directional sequence?
Chapter 16
HUMAN EVOLUTION Homework
16-2 How Populations Evolve
• Natural Selection Changes Trait
Distribution in a Population
• What is stabilizing selection?
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