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Patterns of
Evolution
How it works
Natural Selection
Evidence of evolution Speciation
Which type of selection is occurring in a cricket population that is
changing from curved wings to flat wings?
100 points
What process of natural selection favors the extreme phenotypes of a trait and eliminates intermediate phenotypes?
?
300 points
The situation in which allele frequencies in the gene pool of a
population remain constant is called
400 points
The allele frequencies of a population are more likely to change if
100 points
a. there are no disastersb. there is no gene flowc. mating is not random
d. there are no mutations
The cheetahs have very little variation in their population. This is due in part to an ice age thousands of years ago which drastically reduced their population and more recently, it is due to poaching and habitat loss. The cheetahs loss of variation occurred as a result of ________.
300 points
A horse and a donkey can mate to produce a mule. The mule is sterile and cannot reproduce. Using this example, explain that a horse and donkey are NOT the same species.
500 points
200 points
If a mutation introduces a new skin color in a lizard population, which of the following would determine if the frequency of that new phenotype might increase
If all of the alleles for a trait are equally favorable in the
environment, what happens to natural selection for that trait?
300 points
If a cricket population is changing from curved wings to flat wings, which wing shape should be the
fittest for the environment?
400 points
According to fossil evidence, whales evolved from 4-legged ancestors. The modern baleen whale has forelimbs, but inspection of its skeleton reveals only tiny vestigial hind limbs. What is the best explanation for this loss of hind limbs in the baleen whale?
500 points
Penguin feathers and eagle feathers are structurally similar. Penguins need feathers for warmth while eagles use them in flight. These are _____________________structures.
200 points
Which of the following indicates a recent common ancestor?
a. homologous structures
b. analogous structures
c. flight
300 points
When a species includes organisms with a great deal of variation, what happens to the chances of survival
after a catastrophe?
200 points
Two species of lizard are separated by the formation of a wide river. Even when the climate changes and the river dries up, the two species do not interbreed. This is ______________ isolation.
300 points
The mating dance of the blue-footed booby creates __________ isolation
with other species of birds.?
400 points