Ecology Test 1 Multiple Choice

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Author:
kamrunsreno
ID:
238407
Filename:
Ecology Test 1 Multiple Choice
Updated:
2013-10-02 19:22:26
Tags:
Ecology
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Description:
The following statements will be used in multiple choice questions, so understand the principles and meanings well enough to answer questions about each.
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  1. Which of the following can cause evolution? 
    Directional Selection
    directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.
  2. Which of the following can cause evolution? 
    The founder effect
    founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
  3. Which of the following can cause evolution? 
    Fitness
    describes the ability to both survive and reproduce, and is equal to the average contribution to the gene pool of the next generation that is made by an average individual of the specified genotype or phenotype. If differences between alleles of a given gene affect fitness, then the frequencies of the alleles will change over generations; the alleles with higher fitness become more common. This process is called natural selection.
  4. Which of the following can cause evolution? 
    Directional selection can occur through
    • Disruptive Selection
    • Stabilizing Selection
    • Directional Selection
  5. Which of the following can cause evolution? 
    The strength of the effect of gene flow on phenotypes is related to
    fitness

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