| Concepts | Questions | Media Resources |
| 18.1 Evolution in a Genetic Context
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- The Hardy-Weinberg law defines evolution in terms of allele frequency changes in a population over time.
- Mutations, gene flow, nonrandom mating, genetic drift, and natural selection can cause allele frequency changes in a population.
- The raw material for evolutionary change is mutations. Recombination of genes is another source in sexually reproducing organisms.
| - Evolution that occurs within a population is called _______________.
Answer - What is the gene pool of a population?
Answer - What are the frequencies of the B and b alleles in a population made up of 35 BB, 40 Bb, and 25 bb individuals?
Answer - What are the equations p + q = 1 and p2 + 2pq + q2 = 1 used for?
Answer - What does each value in the expressions p + q and p2 + 2pq + q2 stand for?
Answer - What is Hardy-Weinberg equilibrium and what does it mean if a population is not in Hardy-Weinberg equilibrium?
Answer - What are the 5 conditions which must be met by a population in order for Hardy-Weinberg equilibrium to apply?
Answer - The movement of alleles from one population to another is called _______________, while the loss of alleles from a population due to random chance is called ________________.
Answer
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Essential Study Partner
Summaries of major points:- What causes variations?
- Microevolution
- Genetic mutations
- Gene flow
- Nonrandom mating
- Genetic drift
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Animation Quizzes
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| 18.2 Natural Selection
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- Natural selection causes changes in allele frequencies in a population due to the differential ability of certain phenotypes to reproduce.
- Natural selection results in adaptation to the environment. The three types of natural selection are: directional selection, stabilizing selection, and disruptive selection.
| - What happens during directional selection?
Answer - When intermediate phenotypes are selected against, the selection pressure is called ______________; but when the intermediate phenotype is the one favored, the selection pressure is called ______________.
Answer - How does heterozygosity prevent the loss of recessive alleles, even when they are deleterious?
Answer
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Essential Study Partner
Summaries of major points:- Natural selection is the process that results in adaptation of a population to the environment
- Types of selection
- Maintenance of variations
- Diploidy and the heterozygote
- Sicle-cell disease
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Study Guides
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| 18.3 Speciation
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- New species come about when populations are reproductively isolated from other, similar populations.
- Adaptive radiation is the rapid development of several species from a single species; each species is adapted in a unique way.
| - What are the two major ways in which speciation can occur?
Answer - What is the biological definition of a species?
Answer - What are reproductive isolating mechanisms and what is their importance in maintaining species?
Answer - What are the five prezygotic isolating mechanisms?
Answer - Speciation occurring because of geographic isolation of populations is called ____________, while speciation occurring without physical isolation of populations is called ____________.
Answer - The rapid development and spread of many species from one to take advantage of open habitats is called what?
Answer
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Essential Study Partner
Summaries of major points:- Speciation is...
- A biological species is...
- Reproductive isolating mechanisms
- Modes of speciation
- Adaptive radiation
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Hardy-Weinberg equilibrium (2202.0K)