Biology II exam 1

Last update by mayurcooled on 04/23/2014
214459 People have viewed this Quiz
  • Share

Which of Darwin's ideas had the strongest connection to Darwin having read Malthus's essay on
human population growth?
A) The ability of related species to be conceptualized in "tree thinking"
B) Variation among individuals in a population
C) Descent with modification
D) Struggle for existence
E) That the ancestors of the Galapagos finches had come from the South American mainland

Answer:
D) Struggle for existence

View Biology II exam 1 as Flashcard Deck

Related Quiz Content
  • smiraclelynch
    Answered in Biology II exam 1
    Which of these evolutionary agents is most consistent at causing populations to become better suited to their environments over the course of generations?
    A) Natural selection
    B) Mutation
    C) Non-random mating
    D) Gene flow
    E) Genetic drift
    A) Natural selection
  • smiraclelynch
    Answered in Biology II exam 1
    Heterozygote advantage should be most closely linked to which of the following?
    A) stabilizing selection
    B) sexual selection
    C) random selection
    D) disruptive selection
    E) directional selection
    A) stabilizing selection
  • smiraclelynch
    Answered in Biology II exam 1
    What is thought to be the correct sequence of these events, from earliest to most recent, in the
    evolution of life on Earth?
    1. origin of mitochondria
    2. origin of multicellular eukaryotes
    3. origin of chloroplasts
    4. origin of cyanobacteria
    5. origin of fungal-plant symbioses
    A) 4, 1, 2, 3, 5 B) 3, 4, 1, 2, 5 C) 4, 1, 3, 2, 5 D) 4, 3, 2, 1, 5 E) 4, 3, 1, 5, 2
    C) 4, 1, 3, 2, 5
  • smiraclelynch
    Answered in Biology II exam 1
    If the original finches that had been blown over to the Galapagos from South America had already been genetically different from the parental population of South American finches, even before
    adapting to the Galapagos, this would have been an example of
    A) genetic drift.
    B) bottleneck effect.
    C) founder's effect.
    D) all three of these
    E) both A and C
    E) both A and C
  • smiraclelynch
    Answered in Biology II exam 1
    A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 25% of the animals display a recessive trait (aa), the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants.
    In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of the allele a is 0.4. What is the percentage of the population that is homozygous for this allele?

    A) 16 B) 40 C) 32 D) 36 E) 4
    A) 16
  • smiraclelynch
    Answered in Biology II exam 1
    Beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the
    plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible. What kind of speciation has occurred in this example, and what has driven it?
    A) sympatric speciation, sexual selection
    B) allopatric speciation, behavioral isolation
    C) sympatric speciation, habitat differentiation
    D) allopatric speciation, ecological isolation
    E) sympatric speciation, allopolyploidy
    C) sympatric speciation, habitat differentiation
  • smiraclelynch
    Answered in Biology II exam 1
    Sexual dimorphism is most often a result of
    A) pansexual selection. B) artificial selection.
    C) intersexual selection. D) stabilizing selection.
    C) intersexual selection
  • smiraclelynch
    Answered in Biology II exam 1
    Theoretically, the production of sterile mules by interbreeding between female horses and male donkeys should
    A) weaken the intrinsic reproductive barriers between horses and donkeys.
    B) cause convergent evolution.
    C) eventually result in the formation of a single species from the two parental species.
    D) strengthen postzygotic barriers between horses and donkeys.
    E) result in the extinction of one of the two parental species.
    D) strengthen postzygotic barriers between horses and donkeys.
  • smiraclelynch
    Answered in Biology II exam 1
    The biological species concept is inadequate for grouping
    A) plants.
    B) asexual organisms.
    C) parasites.
    D) sympatric populations.
    E) animals that migrate.
    B) asexual organisms.
  • smiraclelynch
    Answered in Biology II exam 1
    An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to
    A) change the atmosphere from oxidizing to reducing.
    B) prevent the formation of an ozone layer.
    C) make it easier to maintain reduced molecules.
    D) cause iron in ocean water and terrestrial rocks to rust (oxidize).
    E) make life on land difficult for aerobic organisms.
    D) cause iron in ocean water and terrestrial rocks to rust (oxidize).