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In the formula p + q = 1:
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P represents the frequency of one of the alleles in the population
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Rare genes may become established in a population by:
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Genetic drift
the founder effect stabilizing selection mutation |
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Natural selection operates on the:
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Organisms
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Major environmental changes may cause a species to respond by:
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Becoming extinct
showing directional selection speciating |
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Mutations occur:
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At random
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Geographic isolation:
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Is the spatial separation of two species
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In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygote genotype is 0.49. The frequency of individuals homozygous for the dominant allele is:
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0.09
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The frequency of the dominant allele is:
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.3
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The frequency of the recessive allele is:
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.7
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The frequency of the heterozygote genotype is:
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2pq= 2 (.7)(.3)=
2 (.21)= .42 |
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Out of 200 people, how many will be homozygous for the dominant allele?
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(.09)(2001)=
18 |
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A city was intensely sprayed the DDT in the 1953 in an effort to control houseflies. The number of flies was immediately greatly reduced. Each year thereafter, the city was again sprayed with DDT, but the flies gradually increased in number until ten years later they were almost as abundant as they were when the control program began. The most likely explaination is:
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The DDT killed susceptible flies but the few that were naturally resistant lived and reproduced, and their offspring repopulated the area
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To an ecologist, an "interbreeding group of individuals that occupies a specific geographic area" is a(n):
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Population
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A particular population of maple trees lives in a place where the environment is becoming progressively more arid (drier). The average surface area of leaves has been decreasing in successive generations. This is an example of:
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Directional selection
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Sympatric speciation is believed to be more common:
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In development of plant species
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