Topic Test Answers
Which of the following species would you most expect to be distributed according to a regular pattern?
Which of the following statements about logistic growth curves is true?
For which method of determining population size is the population not aware of the sampler’s presence?
Which of the following conditions would lead to a small population size?
Which of the following selection pressures is responsible for the limited evolutionary changes experienced by alligators and other crocodilians?
Which of the following is most likely an example of genetic drift resulting from the founder effect?
There are approximately 35,000 bald eagles in Alaska, which covers 586400 square miles. What is the population density for the bald eagles in Alaska?
Orange trees planted in a grove or orchard would most likely fall in which category of population distribution?
Yellowstone National Park has 124 wolves living in it. The park covers 3472 square miles. What is the population density of wolves living in Yellowstone?
Explain how a bottleneck event can enrich recessive traits in the genetics of a population.
A bottleneck randomly leaves only a few survivors, and those survivors may carry recessive alleles more often than the original population did. In the small population that follows, genetic drift can increase the frequency of those alleles, while inbreeding makes it more likely that individuals inherit two copies and show the recessive trait.
Regular distribution is observed for many organisms due to _______.
Which of the following has not resulted in the decline of cheetah populations?
New Zealand has a population of 4,326,380 and has an area of 103,736 mi while Australia has an area of 2,967,909 mi and a population of 21,905,140. Calculate the population density for New Zealand and Australia. Round the population densities to the nearest whole number.
New Zealand’s population density = 4,326,380 people /103,736 mi^2 = 42 people/mi^2. Australia’s population density = 21,905,140 people / 2,967,909 mi^2 = 7 people/mi^2.
Contrast disruptive and stabilizing selections.
While stabilizing selection selects for the most common, normal traits in a population, disruptive selection selects for extremes. Disruptive selection eliminates the very intermediate traits that stabilizing selection preserves.
What are the possible impacts on the limiting factors that determine population size of an extended period of lower than normal rainfall?
Extended drought reduces water availability (a key limiting factor). This lowers plant growth and primary productivity, reduces food and habitat for consumers, intensifies competition for remaining resources, and can raise mortality rates, ultimately decreasing carrying capacity and population size.
The most common type of distribution pattern(s) in nature is(are) _______.
Natural selection is best described as _______.
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