Biochemistry & Biology Practice Questions II with Answers


  1. The blue whale population was decimated by human hunting but is now slowly recovering. The blue whales are an example of a species that has undergone
  • Mutation
  • Sexual selection
  • Bottleneck
  • Random mating
  1. The allele frequencies in a population are p = 0.95 and q = 0.05. What would happen to the allele frequency of q if the population followed the Hardy-Weinberg equilibrium for 20 generations?
  • It would increase
  • It would decrease
  • It would stay the same
  • It would change randomly
  1. The mean beak depth of a particular finch species is 15 millimeters. Assuming the trait is heritable what would happen to the mean beak depth after several generations of stabilizing selection?
  • The mean should be less than 15 mm
  • The mean should be more than 15 mm
  • The mean will change randomly
  • The mean should not change
  1. A sea star roams the intertidal zone eating barnacles. The sea star does not care which type of barnacle it finds, it just eats whatever it finds. What type of selection is the sea star exerting on the barnacle population?
  • A diversifying selection
  • Negative frequency dependent selection
  • Artificial selection
  • Oscillating selection
  1. A population of freshwater fish has been drastically reduced in size due to the construction of a dam. However, over time the population numbers rebound. What has happened to the genetic variability in this population?
  • It has decreased
  • It has increased
  • It stayed the same
  1. Male Anolis lizards use dewlap displays to attract females. If in a single species, males with darker colored dewlaps tend to display in open habitats and males with lighter colored dewlaps tend to display in forested habitats, the resulting offspring may start to diverge into 2 groups. What could be occurring?
  • Random mating
  • Hardy-Weinberg equilibrium
  • Disruptive selection
  • Stabilizing selection
  1. Due to the increased likelihood of deleterious homozygous recessive phenotypes, what can occur when closely related individuals mate and form offspring?
  • Hardy-Weinberg equilibrium
  • Random mating
  • Inbreeding depression
  • Sexual selection
  1. Humans do not follow all of the assumptions of the Hardy-Weinberg equilibrium. What assumptions are true for humans?
  • A large population size
  • No mutations
  • Random mating
  • No selection
  1. A researcher has determined the number of alleles for curled tails in a population of gray squirrels. How would he use this information to determine the allele frequency?
  • Take the number of curled alleles and divide by the total number of tail shape alleles in that population.
  1. A group of 5 red-throated hummingbirds are blown by a storm and land on an isolated island with no other hummingbirds. Over time, they increase in number but their genetic diversity is still quite low. This is an example of
  • The bottleneck effect
  • The founder effect
  • Sexual selection
  • Stabilizing selection

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