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Biology 30 Alberta: Population and Community Dynamics Test Questions and Answers
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Biology 30 Alberta: Population and Community Dynamics Test Questions and Answers
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Biology 30 Alberta: Population and CommunityDynamics Test Questions and Answers
What are the two types of populations? Give an example of each. - Answer✔✔ Open (ex:
tundra); has birth, death, emigration & immigration.
Closed (ex: fish tank); birth and death only, no movement
What are the two types of population growth patterns? - Answer✔✔ J shaped and S shaped.
Describe a J-shaped growth pattern and give an example. - Answer✔✔ exponential; lag phase
->
boom of natality -> stationary phase; increased competition and waste -> huge mortality.
Example: black flies in the tundra.
Describe a S-shaped growth pattern. - Answer✔✔ logistic; lag phase -> boom of growth
pushes
population over carrying capacity -> environmental resistance pushes population down again
->
stable equilibrium
What is environmental resistance? Give three examples. - Answer✔✔ factors from the
environment that lead to decreased natality, increased mortality and emigration.
Examples: limited space, predators, disease, limited resources
, What is carrying capacity? What is the symbol for it? - Answer✔✔ the theoretical maximum
population size that the environment can sustain in the long term; symbol = K
What is biotic potential? - Answer✔✔ maximum reproductive capacity of a species if
resources
were unlimited
Which two strategies affect the biotic potential of a population? - Answer✔✔ r-selection and
Kselection
How does mutation lead to gene pools changing? - Answer✔✔ alleles mutate into another
form; important for variation
How does natural selection lead to gene pools changing? - Answer✔✔ not all individuals have
ability to produce offspring; "survival of the fittest"
How does non-random mating lead to gene pools changing? - Answer✔✔ mating based on
proximity and preference; not all individuals have equal chance of finding mate
How does gene flow lead to gene pools changing? - Answer✔✔ migration; lose via
emigration;
gain via immigration
Does gene flow lead to a new population? - Answer✔✔ No.
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