WorksheetsBIO 182: Post Class Week 7
Total questions: 10
Worksheet time: 4mins
Male birds of different species sing species-specific songs to attract mates. Females only mate with males that sing their species-specific song. This is an example of:
pre-zygotic isolation.
reinforcement.
post-zygotic isolation.
temporal isolation.
Consider the two phylogenies below of five species of related flowers that hold nectar as a reward for their pollinators, five related species of moths, in their spur: The similar pattern of the phylogenies suggests the characteristics coevolved with one another. Which of the following is an accurate statement reflecting the figure above?
This is not an example of co-speciation. Each phylogeny represents the variation present in each population of the flower and the moth.
The flowers and moths cannot co-speciate because co-speciation only occurs in host-parasite relationships.
The flowers and moths coevolved, so that spur-length and tongue-length each evolved because of changes in the other.
The flowers and moths experienced the same allopatric speciation events during their history.
When visiting Hawaii on vacation, a tourist notices that there are many different species of birds that look similar to one another, but are distinct in their ecology and in the morphology (beak size and shape) that helps make them successful in different habitats on the island. The tourist supposes they are closely related and result from an adaptive radiation. Which of the following statements would provide the STRONGEST evidence they are the result of an adaptive radiation?
Some, but not all of the species can hybridize.
The phylogeny of the birds shows a single common ancestor for the group.
The species move throughout all areas of the island.
Variation in beak length within any of the species is distributed like a bell curve.
When taxonomists recognize subspecies, they are identifying:
populations with extremely restricted gene flow due to allopatric isolation.
populations with restricted enough gene flow to develop some population-specific traits, but that can still interbreed with members of other such populations.
populations that will inevitably become separate species as reproductive isolation is nearly complete.
populations that are reproductively isolated from one another.
None of the other answer options is correct.
Biochemical recognition systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
pre-zygotic, temporal separation
pre-zygotic, behavioral isolation
post-zygotic, ecological separation
pre-zygotic, lock and key
post-zygotic, temporal separation
Rarely, hybridization has occurred between polar bears and grizzlies. The presence of grolars and pizzlies:
suggests that polar and grizzly bears are different species because neither hybrid is like the parent.
suggests that another glaciation event is needed for polar bears to become another species.
suggests that the time since divergence may not be sufficient for complete reproductive isolation to have occurred.
suggests that polar and grizzly bears are not different species based on the biological species concept.
suggests that polar and grizzly bears are not different species because there are no barriers to reproduction.
Polar bears arose from a vicariant event.
true
false
What additional information would assist you in determining whether polar bears and grizzlies are different species, based on the biological species concept?
I. whether the F1 is fertile
II. whether F1 offspring are viable
III. the amount of DNA sequence divergence between polar and grizzly bears
IV. the geographic distribution of polar and grizzly bears
II only
I only
III and IV only
I and III only
I and II only
The origin of polar bears was the result of:
peripatric speciation.
sympatric speciation.
allopatric speciation.
New species can form through allopatric or sympatric speciation. Which of the following mechanisms will act more strongly on populations that are initially separated in allopatry than on those initially separated in sympatry?
disruptive selection
gene flow
genetic drift
reinforcement
