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| A balanced polymorphism is the occurence of two traits or alleles in a population, each of which may be at a selective advantage in different habitats |
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| Which of the following is a term that describes genetic variation for a single trait? |
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| Gene flow is the movement of genetic traits from one population to another - which simply indicates that two populations are interbreeding |
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| Alleles are different forms of the same gene, for example the alleles for brown or blue eyes |
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| When a population is in Hardy-Weinberg equilibrium, it means that the populations' genetic variation changes rapidly from one generation to the next |
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| The allele that causes sickle cell anemia is maintained in the human population because people who are heterozygous for the normal and sickling allele are at a selective advantage in areas where malaria is common |
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| Mutation is the source of new alleles in a population |
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| A genetic bottleneck is thought to have occurred in the evolutionary past of a species if the genetic variation within the species is exceptionally high |
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| Antibiotic resistance occurs when bacteria mutate in response to the presence of an antibiotic |
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| In evolutionary terms, "adaptation" is limited to the ability of a single individual to adapt to new surroundings |
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| The effects of genetic drift tend to be most pronounced in small populations |
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| The founder effect explains that small populations, founded by sampling only a few individuals from a source population, often have only a small portion of the genetic variation of the species |
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| Hardy-Weinberg calculations predict that in a large, randomly breeding population, new mutations are likely to be eliminated quickly |
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| Microevolution is the special circumstances of evolution of microscopic organisms such as bacteria |
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| Microevolution is usually considered to be the short-term genetic changes within a species; macroevoution describes longer-term speciation and divergence of particular lineages |
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Term
Which of the following is a mechanism of genetic divergence that is the result of small population size
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| Stabilizing selection is predicted to be the most common form of natural selection operating when the environment is changing quickly |
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| Which of the following is a correct match between a type of natural selection and the traits being selected for? |
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Definition
| The selection for baby size in mammals is an example of stabilizing selection |
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Term
| Which of the following is the best definition of gene flow |
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Definition
| The movement of alleles into and out of a population. |
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Term
| Genetic drift is the random fluctuation of the frequency of certain traits in a population due to strong natural selection |
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| Which is the best example of disruptive selection |
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| Which of the following types of selection is occuring if two different phenotypes are an advantage? |
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| Which of the following conditions must be met for a population to be considered to be in Hardy-Weinberg equilibrium? |
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