WorksheetsSpeciation
Total questions: 28
Worksheet time: 15mins
When the Grand Canyon in Arizona formed, two populations of one squirrel species were separated by the giant canyon. This is an example of _____________.
Temporal isolation
Behavioral isolation
Geographic isolation
Three populations of crickets look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?
A temporal reproductive isolating mechanism
A postzygotic isolating mechanism
A behavioral reproductive isolating mechanism
A gametic reproductive isolating mechanism
The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
Postzygotic isolation exists between the two frog species.
Prezygotic isolation exists between the two frog species.
These two species are likely in the process of fusing back into one species.
The hybrids form a separate species under the biological species concept.
Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. 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. These two juniper species are kept separate by _____.
Habitat isolation
Temporal isolation
Gametic isolation
Behavioral isolation
How are two different species most likely to evolve from one ancestral species?
Sympatrically, by a point mutation affecting morphology or behaviorn
Sympatrically, due to extensive inbreeding
Allopatrically, due to extensive inbreeding
Allopatrically, after the ancestral species has split into two populations
What is founder effect?
A process in which random events cause unpredictable fluctuations in allele frequencies from one generation to the next.
When a few individuals become isolated from a larger population and form a new population whose gene pool composition is not reflective of that of the original population.
When the size of a population is reduced, as by a natural disaster or human actions, he surviving population is no longer genetically representative of the original population.
The evolutionary process that occurs when a population is exposed to environmental factors that cause individuals with certain heritable traits to have greater reproductive success
A new river forms and splits two populations, causing ______________ speciation
Sympatric
Allopatric
Extreme
Convergent
Two organisms are of the same species if they _. Select 3
Interbreed
Produce viable offspring
Produce fertile offspring
Share many morphological characteristics
Share many molecular (DNA, RNA, and protein) similarities
Which of the following terms describes when interbreeding to produce viable and fertile offspring is no longer possible?
Reproductive isolation
Allopatric isolation
Sympatric isolation
Prezygotic isolation
Postzygotic isolation
What are the two forms of speciation?
Allopatric
Sympatric
Prezygotic
Postzygotic
Genetic drift
Which form of speciation involves geographic barriers?
Allopatric
Sympatric
Prezygotic
Postzygotic
Genetic drift
Why does geographic isolation result in speciation?
The populations are exposed to different selective pressures in different environments
The populations are exposed to different selective pressures within the same environment
The populations are exposed to the same selective pressures in different environments
The populations are exposed to the same selective pressures within the same environment
Both prezygotic and postzygotic barriers maintain reproductive isolation between populations by preventing _
Gene flow
Genetic drift
Natural selection
Mutations
All mechanisms of evolution
Prezygotic barriers impede _. Select 2
Mating
Fertilization
Hybrid viability
Hybrid fertility
Postzygotic barriers impede _. Select 2
Mating
Fertilization
Hybrid viability
Hybrid fertility
What is habitat isolation (prezygotic)?
Species occupy different living or mating spaces within the same environment
Species mate at different times (day, season, year)
Species have differences in courtship and mating
Species have different genitalia; sex and subsequent fertilization is highly unlikely
The sperm of one species is unable to fertilize the egg of another
What is temporal isolation (prezygotic)?
Species occupy different living or mating spaces within the same environment
Species mate at different times (day, season, year)
Species have differences in courtship and mating
Species have different genitalia; sex and subsequent fertilization is highly unlikely
The sperm of one species is unable to fertilize the egg of another
What is hybrid breakdown?
The offspring of two species are unable to fully develop or survive
The offspring of two species are sterile (unable to have offspring)
Some offspring of two species are viable and fertile, but when they mate with one another or either parent species, the offspring are inviable or sterile
Mating between two species fails to produce hybrid zygotes
Mating between two species produces geographically isolated hybrids
