Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
34 Cards in this Set
- Front
- Back
|
A coyote, which can alter its food intake to match seasonal abundance of plants, fruits, or small animals, is considered to be ________.
|
a generalist, able to be flexible in major dimensions of its niche |
|
|
A number of coyotes move into an area and begin to eat a population of small harvest mice. After several years, the harvest mice are much speedier runners than before the coyotes came. This is an example of |
directional selection |
|
|
A population is a group of ________. |
individuals of a single species that live and interact in one area |
|
|
A population's age structure generally ________. |
indicates the numbers (frequency, or percentage) of individuals in each age class |
|
|
A small moth pollinates native trees when they bloom in April. Some of the moths emerge in early March and discover a different blooming shrub to use as a resource. This is an example of what, over time, could be ________ |
sympatric speciation |
|
|
A species has evolved an asexual mode of reproduction by having offspring develop from unfertilized eggs. Which of the following will be true of this species' response to natural selection? |
There will be less genetic variation from sexual recombination and a risk of not adapting quickly to environmental change. |
|
|
An example of a density-independent factor would be ________ |
cold weather causing the lake to freeze |
|
|
Density-dependent factors ________. |
include the effects of disease, predators and food on a single species within a community |
|
|
Endemic species ________. |
are found only in one place on the planet |
|
|
Extinction is ________.
|
a natural process |
|
|
Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year ________. |
are K-selected |
|
|
Heavy rains and mudslides cause a river to change course, isolating two groups of lizards from one another. Over a long period of time ________. |
the groups will probably diverge genetically, and speciation may occur |
|
|
High population density can ________. |
increase the incidence of disease transmission and food scarcity |
|
|
In a population of field mice, an example of an adaptive trait that could help with reproduction and/or survival would be ________.
|
having a bit more fur to withstand cold weather |
|
|
Most extinction is ________. |
gradual |
|
|
One example of artificial selection is ________. |
broccoli, cauliflower, cabbage and brussels sprouts bred from Brassica oleracea |
|
|
Phylogenetic trees ________. |
trace the flow of evolutionary change and diversification for a particular group of organisms |
|
|
Population distribution describes ________. |
spatial arrangement of individuals of a single species within a particular area or ecosystem |
|
|
Populations lacking any environmental resistance tend to increase by |
exponential growth |
|
|
The carrying capacity is the ________. |
maximum sustainable population that a given environment can support |
|
|
The fossil record clearly shows that ________ |
all species evolve from pre-existing species |
|
|
The functional role of a species in its community is its |
niche |
|
|
The two processes that determine the world's current biodiversity are |
extinction and speciation rates |
|
|
Assuming the populations are of equal size, the length of time necessary for significant divergence to take place in the populations depends on ________. |
the kinds of mutations in the populations and the similarity of the two isolated habitats |
|
|
In the initial squirrel population prior to the isolation, it is safe to assume tha |
the population is interfertile, i.e. any male could successfully mate with any female |
|
|
The barrier between the squirrel populations |
is an effective barrier to mating and gene-flow between the two populations |
|
|
The major force(s) causing the genetic divergence of the two populations is/are |
mutation and natural selection |
|
|
Which of the following gives the major factors that determine a population's growth rate?
|
birth rate, death rate, emigration, immigration |
|
|
Which of the following is accurate? |
Ecotourism combines wildlife conservation with economic benefits. |
|
|
Which of the following is true? |
Species on Earth today are but a fraction of all species that ever lived. |
|
|
Which of the following pairs contains, first, an r-selected organism and, second, a K-selected organism?
|
grasshopper; whale |
|
|
Which of the following statements most accurately describes the decline of frog populations on Monteverde in Costa Rica? |
A warmer climate and the invasion of chytrid fungi are both implicated but not proven |
|
|
Which of the following would be most vulnerable to extinction? |
an orchid endemic to a mountaintop forest where logging is occurring |
|
|
Which of the following would represent a clumped population dispersion pattern?
|
a pod of 40 migrating gray whales |
