A postfertilization barrier to reproduction has what result?

2pts) A postfertilization barrier to reproduction has what result? *

  •  mutations in genes that control development
  •  offspring that fail to develop
  •  mechanical isolation of a species
  •  gamete incompatibility

(1 pt) What do a butterfly, a tree, and my uncle Fred have in common? *

  •  they are all members of the same kingdom
  •  they are all prokaryotic
  •  they are all composed of cells with cell walls
  •  their cells have membrane bound organelles
  •  none of these

(1 pt) Populations that change due to genetic drift *

  •  haven’t really undergone evolutionary change.
  •  will then be subject to strong sexual selection.
  •  have evolved.
  •  will soon change back to the original form as a result of natural selection.
  •  none of the above

(1 pt) The combination of all traits that allow organisms to survive with the potential to produce viable offspring is called: *

  •  evolution
  •  natural selection
  •  fitness
  •  biological diversity
  •  a mistake

(2 pts) Natural selection: *

  •  is a process by which nature, through biological and environmental factors, “selects” the combination of traits best suited to the environment
  •  is a random process
  •  is the term for selecting the most desirable traits in plants and animals and preserving these traits through selective breeding
  •  a & b only
  •  a, b, and c

(2 pts) How does polyploidy cause reproductive isolation? *

  •  it changes the timing of reproduction.
  •  it changes instructions for how to make reproductive anatomy.
  •  it alters the number of chromosomes in sex cells.
  •  it changes the prey preference of the organism.

(2 pts) The Hardy-Weinberg Equation is an important part of the study of inheritance and ultimately, evolution. If their assumptions don’t apply for a specific trait in a population, then what could be a possible consequence? *

  •  change of allele frequencies
  •  geneticists will have to redo all of the Mendelian studies
  •  equilibrium
  •  spontaneous generation
  •  none of these

(1 pt) Evolution that occurs as a result of a dramatic reduction in population size is called *

  •  founder effect.
  •  genetic drift.
  •  gene flow.
  •  population bottleneck.
  •  none of the above

(2 pts) Biological _________ are groups of individuals of the same _________ that are subdivided from other _________. *

  •  species, population, species
  •  populations, species, populations
  •  populations, organism, organisms
  •  races, populations, races
  •  none of the above

(2 pts) Which of the following is NOT a part of the theory of natural selection? *

  •  individuals in a population vary.
  •  some variation can be passed on to offspring.
  •  populations produce more offspring than the environment can support.
  •  all species are descended from a common ancestor.
  •  none of the above

(2 pts) Your friend was diagnosed with strep throat 2 months ago. She was treated with antibiotics for 10 days, but 2 weeks after treatment, the symptoms returned. She was given a different antibiotic and her symptoms improved again, initially, but then got worse. What is happening? *

  •  your friend has taken antibiotics so long that she has become tolerant to them, making them ineffective.
  •  exposure to antibiotics has caused each individual bacterial cell to evolve resistance to the antibiotics.
  •  your friend was originally infected with some bacteria that were resistant to these two antibiotics and the bacteria multiplied.
  •  your friend probably doesn’t have a bacterial infection. There must be some other reason for her symptoms.
  •  none of the above

(2 pts) After a rapid change in climate, one population of bird quickly adapts to the change, but others in the area do not. What could you conclude about the quickly adapting population? *

  •  they had a greater need to evolve than the other population.
  •  they already had some alleles in their genome that were adaptive in the new environment.
  •  they reproduced more slowly than the non-adapting population.
  •  they had a higher rate of mutation than the other population.

(1 pt) When a population of organisms is evolving, what can you be sure is happening? *

  •  it’s improving.
  •  it’s stable (no change).
  •  it’s getting bigger.
  •  it’s changing.
  •  all of the above.

(2 pts) What would happen if a mutation created a new allele that decreased fitness? *

  •  the new allele would spread through the population and decrease the fitness of that population.
  •  the new allele would decrease the fitness of the individual that possessed it, and that individual would have few or no offspring.
  •  the new allele would have to change back to an allele of higher fitness so the possessor of that allele could maintain its fitness.
  •  the individual with the new allele would wait for an environmental change so that its fitness would increase again.
  •  none of the above

(1 pt) Assortative matings have what effect on populations? *

  •  they cause one sex to be much different than the other.
  •  they cause isolated groups to be more similar to each other.
  •  they increase the rate of mutations.
  •  they maintain appearance differences between groups.
  •  none of the above

(1 pt) Many lines of evidence suggest that human populations aren’t distinct races. What keeps us so similar even though adaptations to local conditions have occurred? *

  •  members of different populations mate with each other.
  •  natural selection has acted in the same way for all groups of humans.
  •  populations mate assortatively.
  •  sexual selection has acted in the same way for all groups.
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