Podcast
Questions and Answers
Which statement aligns with typological thinking?
Which statement aligns with typological thinking?
- Variation among individuals within a population is insignificant.
- Species are imperfect and constantly evolving towards better forms.
- Species are unchanging and represent a perfect form. (correct)
- Species exhibit continuous change over extended periods.
Which is a core tenet of Darwin's postulates for evolution by natural selection?
Which is a core tenet of Darwin's postulates for evolution by natural selection?
- The environment can support unlimited population growth.
- Traits are heritable. (correct)
- Acquired traits are heritable and passed on to offspring.
- All individuals in a population have equal fitness.
In a gene with two alleles where heterozygotes have superior fitness, what is the long-term fate of the alleles?
In a gene with two alleles where heterozygotes have superior fitness, what is the long-term fate of the alleles?
- One allele will be lost due to selection favoring the other.
- It is random as to which allele will go to fixation.
- Both alleles will remain present in the population. (correct)
- One allele will eventually reach fixation.
Which of the following statements about evolution is TRUE?
Which of the following statements about evolution is TRUE?
Which evolutionary process produces new alleles, typically with neutral or fitness-reducing effects, and always increases genetic variation?
Which evolutionary process produces new alleles, typically with neutral or fitness-reducing effects, and always increases genetic variation?
Which evolutionary process reduces genetic differences between populations and can either increase or decrease fitness?
Which evolutionary process reduces genetic differences between populations and can either increase or decrease fitness?
Which of the following conditions could lead to balancing selection in a population?
Which of the following conditions could lead to balancing selection in a population?
What scenario exemplifies balancing selection?
What scenario exemplifies balancing selection?
Flashcards
Typological Thinking
Typological Thinking
Species are unchanging and perfectly formed, with no variation being important.
Darwin's Postulates
Darwin's Postulates
- Traits are heritable.
- More offspring are produced than can survive.
- Individuals vary in their heritable traits.
- Some individuals reproduce more than others due to these traits.
Heterozygote Advantage Outcome
Heterozygote Advantage Outcome
Both alleles will remain in the population, maintained by the heterozygote advantage.
True Statements About Evolution
True Statements About Evolution
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Effect of Mutation
Effect of Mutation
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Effect of Gene Flow
Effect of Gene Flow
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Driver of Natural Selection
Driver of Natural Selection
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Genetic Drift
Genetic Drift
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Balancing Selection Causes
Balancing Selection Causes
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Study Notes
- Typological thinkers believe species are perfect and do not change over time.
- Darwin's postulates for evolution by natural selection include: traits must be heritable, some individuals will have higher fitness, and more individuals are produced than an environment can support.
- When the heterozygote has superior fitness to both homozygotes, both alleles will remain in the population in the long term.
- Natural selection amplifies alleles that are beneficial under current, local conditions, not necessarily for the population in the long run.
- An organism's survival and reproduction are not entirely random, natural selection plays a role.
- Natural selection does not always increase fitness by maintaining genetic variation.
- Loss of a trait can sometimes be adaptive.
- Natural selection and evolutionary change can indeed occur in a short period of time.
- Individuals can acclimate, but only populations adapt.
- Mutation increases genetic variation but is typically neutral or reduces fitness.
- Gene flow reduces genetic differences between populations, which can impact fitness.
- Natural selection is driven by differential reproductive success.
- Genetic drift involves random changes in allele frequencies over time.
- Balancing selection can result from frequency-dependent selection and heterozygote advantage.
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Description
Key concepts in evolution and natural selection are reviewed. Topics covered include typological thinking, Darwin's postulates, heterozygote advantage, and the role of natural selection. The lesson also addresses adaptation, mutation, and genetic variation within populations.
