First
quiz of the semester, on Chapters 20 and 21.
Instructions:
First
quiz of the semester, on Chapters 20 and 21. Give yourself 20 minutes
to take this quiz. This is a timed assessment and the computer will
tell you how much time you have left.
Question
Multiple
Choice
1 Points
Question: The breakup of Pangaea (right)
during the Mesozoic era resulted in
Answer:
a drop in sea level. an increasingly distinct biota
on each continent. development of an icehouse climate.
a proliferation of flying forms
in many lineages.
Question
Multiple
Choice
1 Points
Question: Which of the following statements
about evolutionary changes in populations of the three-spined
stickleback (Gasterosteus aculeatus) is false?
Answer:
Stasis is most common during periods
when environmental change is low. The three-spined stickleback inhabits
both marine and freshwater habitats. Spine reduction in the stickleback
is caused by variation in predation in different habitats. Spine reduction in the stickleback
evolved many times in different populations. Molecular data show that all sticklebacks
with reduced spines are closely related.
Question
Multiple
Choice
1 Points
Question: Which of the following has not
been an evident trend in the evolution of Earth's major faunas?
Answer:
Overall increase in body size.
Overall increase in complexity.
Evolutionary change is greatest
for lineages found in harsh, stable environments. Predators become more efficient.
Question
Short
Answer/Essay
2 Points
Question: Define microevolution.
Answer:
Microevolutionary changes take place during the lifetimes
of species. The mechanisms of evolutionary change that alter
allele frequencies lead to microevolution.
Question
Multiple
Choice
1 Points
Question: Which of the following statements
regarding genetic variability in a population is true?
Answer:
Genetic variation in populations
has never been demonstrated experimentally. The number of offspring produced
by an organism has a great effect on allele frequencies in a
population. Changes in allele frequencies are
caused by changes in the number of offspring produced in the
population. The agricultural development of
strains of plants and animals carrying desirable traits requires
natural genetic variability in the original population. Reproductive success is determined
by evolution.
Question
Short
Answer/Essay
1 Points
Question: Provide an example of a species
that exhibits genetic variation within its populations.
Answer:
Many examples were discussed in class, but you could
use almost any species, if you back up your claim with evidence
or logical reasoning.
Question
Short
Answer/Essay
2 Points
Question: Describe stabilizing selection.
Answer:
It is a form of natural selection, in which extreme
forms of a trait are selected against and intermediates are
favored (they have higher relative fitness).
Question
Multiple
Choice
1 Points
Question: Which of the following is not
an essential assumption required to maintain Hardy-Weinberg
equilibrium in a population?
Answer:
Random mating No migration Natural selection Large population size No mutation
