20 Questions
Which term describes the occurrence when natural selection maintains stable frequencies of two or more phenotypic forms in a population?
Balancing selection
What is the term for the advantage that heterozygotes have a higher fitness than both homozygotes?
Heterozygote advantage
Which type of selection occurs when the fitness of a phenotype depends on its frequency in the population?
Frequency-dependent selection
What is the term for the advantage that the sickle-cell allele causes deleterious mutations in hemoglobin but also confers malaria resistance?
Heterozygote advantage
Which type of selection includes heterozygote advantage and frequency-dependent selection?
Balancing selection
What is the term for the occurrence when natural selection maintains stable frequencies of multiple phenotypic forms in a population?
Balancing selection
Which type of selection occurs when the fitness of a phenotype depends on its frequency in the population?
Frequency-dependent selection
What is the term for the advantage that heterozygotes have a higher fitness than both homozygotes?
Heterozygote advantage
Which type of selection includes heterozygote advantage and frequency-dependent selection?
Balancing selection
What is the term for the advantage that the sickle-cell allele causes deleterious mutations in hemoglobin but also confers malaria resistance?
Heterozygote advantage
Which type of selection depends on the frequency of a phenotype in a population?
Frequency-dependent selection
What advantage do 'left-mouthed' fish have in a population of scale-eating fish when 'right-mouthed' individuals become more common?
Prey are more likely to guard their left side
What is sexual selection?
Natural selection for mating success
What can sexual selection result in?
Sexual dimorphism
Why can natural selection not fashion perfect organisms?
All of the above
What is the main limitation of natural selection?
It can only act on existing variations
What limits evolution?
Historical constraints
Why are adaptations often compromises?
Because they involve trade-offs
What factors interact in the process of natural selection?
Chance, natural selection, and the environment
What is sexual dimorphism?
The marked differences between the sexes in secondary sexual characteristics
Test your knowledge on balancing selection with this quiz! Learn about the different forms of balancing selection, including heterozygote advantage and frequency-dependent selection. Explore how natural selection maintains stable frequencies of phenotypic forms in a population.
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