BIO 101 EXAM 4 QUIZZES &
ANSWERS(GRADED A+)
Which of Darwin's ideas had the strongest connection to Darwin having read Malthus's
essay on human population growth? - ANSWER the struggle for existence
DDT was once considered a "silver bullet" that would permanently eradicate insect
pests. Instead, today DDT is largely useless against many insects. Which of the
following should have occurred for this pest eradication effort to be successful in the
long run? - ANSWER None of the individual insects should have possessed genomes
that made them resistant to DDT.
A biologist studied a population of squirrels for 15 years. During that time, the
population was never fewer than 30 squirrels and never more than 45. Her data showed
that over half of the squirrels born did not survive to reproduce, because of both
competition for food and predation. In a single generation, 90% of the squirrels that
were born lived to reproduce, and the population increased to 80. Which inference(s)
about this population might be true? - ANSWER Both A and C could be true.
A. The amount of available food may have increased.
C. The number of predators that prey upon squirrels may have decreased.
Which of the following are problematic when the goal is to construct phylogenies that
accurately reflect evolutionary history? - ANSWER polyphyletic and paraphyletic taxa
The various taxonomic levels (genera, classes, etc.) of the hierarchical classification
system differ from each other on the basis of - ANSWER their inclusiveness.
Linnaeus was a "fixist" who believed that species remained fixed in the form in which
they had been created. Linnaeus would have been uncomfortable with - ANSWER
phylogenies.
How does phylogeny differ from systematics? - ANSWER in the classification of
organisms by evolutionary history
Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J.
monosperma) have overlapping ranges. If pollen grains (which contain sperm cells)
from one species are unable to germinate and make pollen tubes on female ovules
(which contain egg cells) of the other species, then which of these terms are applicable?
1. sympatric species
2. prezygotic isolation
3. postzygotic isolation
4. allopatric species
5. habitat isolation
ANSWERS(GRADED A+)
Which of Darwin's ideas had the strongest connection to Darwin having read Malthus's
essay on human population growth? - ANSWER the struggle for existence
DDT was once considered a "silver bullet" that would permanently eradicate insect
pests. Instead, today DDT is largely useless against many insects. Which of the
following should have occurred for this pest eradication effort to be successful in the
long run? - ANSWER None of the individual insects should have possessed genomes
that made them resistant to DDT.
A biologist studied a population of squirrels for 15 years. During that time, the
population was never fewer than 30 squirrels and never more than 45. Her data showed
that over half of the squirrels born did not survive to reproduce, because of both
competition for food and predation. In a single generation, 90% of the squirrels that
were born lived to reproduce, and the population increased to 80. Which inference(s)
about this population might be true? - ANSWER Both A and C could be true.
A. The amount of available food may have increased.
C. The number of predators that prey upon squirrels may have decreased.
Which of the following are problematic when the goal is to construct phylogenies that
accurately reflect evolutionary history? - ANSWER polyphyletic and paraphyletic taxa
The various taxonomic levels (genera, classes, etc.) of the hierarchical classification
system differ from each other on the basis of - ANSWER their inclusiveness.
Linnaeus was a "fixist" who believed that species remained fixed in the form in which
they had been created. Linnaeus would have been uncomfortable with - ANSWER
phylogenies.
How does phylogeny differ from systematics? - ANSWER in the classification of
organisms by evolutionary history
Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J.
monosperma) have overlapping ranges. If pollen grains (which contain sperm cells)
from one species are unable to germinate and make pollen tubes on female ovules
(which contain egg cells) of the other species, then which of these terms are applicable?
1. sympatric species
2. prezygotic isolation
3. postzygotic isolation
4. allopatric species
5. habitat isolation
