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25 Cards in this Set
- Front
- Back
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What is the goal of population genetics?
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To evaluate the change in the frequency of alleles over time in a population
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What does genetic variation come from? Which is the main reason?
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Sexual reproduction
Mutations (Main) |
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What is a discrete character?
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One that can be classified as an either or
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What is a quantitative character?
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One that varies along a continuum within a population
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Natural selection acts on ____, but only populations ____.
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Individuals
Evolve |
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If a population does not meet the Hardy-Weinberg principle, it can be concluded that the population is ____.
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evolving
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If a population meets the Hardy-Weinberg principle, it can be concluded that the population is ____.
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not evolving
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What is the Hardy-Weinberg principle equation? What does each stand for?
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p^2+2pq+q^2=100%
p=dominant q=recessive |
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Each of the following is considered a form of evolution that negates the HW equilibrium.
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Mutation
Migration Non-random mating Genetic drift Natural selection |
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What is the ultimate source of genetic variation?
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Mutation
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What is generally so slow it has little effect on the Hardy-Weinberg principle?
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Mutation rates
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What is the movement of alleles between populations?
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Migration
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What is the intentional selection for traits based on mating preferences? What are some examples?
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Non-random mating
Strongest, most colorful, loudest |
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Gentic drift is ____ and occurs over time by ____.
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Random
Chance |
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A natural disaster is an example of the _____.
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Bottleneck effect
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The reduction of habitat in the greater prairie chicken is an example of ____.
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Genetic drift or bottleneck effect
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What is the only consistant force in adaptive evolution?
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Natural selection
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What are the three modes of selection?
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Directional
Disruptive Stabalizing |
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What is directional selection?
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Favors indivduals at one end of the phenotypic range
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What is disruptive selection?
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Favors individuals at both extremes of the phenotypic range
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What is stabilizing selection?
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Favors intermediate varians and acts against extreme phenotypes
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Genetic variation population is maintained in several ways. What are they?
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Diploidy
Heterozygote advantage Frequency-dependent selection |
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In negative frequency-dependent selection, ____ phenotypes are favored by selection.
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Rare
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In positive frequency-dependent selection, ____ phenotypes are favored by selection.
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Common
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hypertensive emergency treatment
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1. lower the bp-
IV nitroprusside and labetalol if MI, nitroglycerin is preferred IV enalaprilat is also being used do not reduce pressure more than 25% in 1-2 hours to not compromise cerebral or myocardial perfusion (keep it above 95-100 diastolic) 2- ct of head r/o subarchnoid hemmorage 3-lp if ct is negative |
