Biological Species Concept
According to the Biological Species Concept, two groups are this word if there is reproductive isolation between them.
What is a species?
Prezygotic barriers halt reproduction by preventing this process.
What is fertilization?
A sterile mule is an example of the following postzygotic barrier.
What is reduced hybrid fertility?
Allopatric speciation is caused by separation based on the following word.
What is geography?
List at least three driving forces of speciation.
What are genetic drift, sexual selection, mutations, and natural selection?
Some cicadas mating every 13 years and others mating every 17 years is an example of the following prezygotic barrier.
What is temporal isolation?
Failure of the development of an embryo is an example of the following postzygotic barrier.
What is reduced hybrid viability?
This mechanism contributes to sympatric speciation and is rarely seen in animals.
What is polyploidy?
List at least three exceptions to the Biological Species Concept.
What are fossils, asexually-reproducing organisms, organisms that can interbreed under captivity, and allopatric populations?
These prezygotic barriers prevent mating but not meeting.
What are behavioral and mechanical isolation?
This can act both as a postzygotic barrier and a factor that contributes to sympatric speciation.
What is polyploidy?
This mechanism that contributes to sympatric speciation is also a driving force of speciation.
What is sexual selection?
Under the Biological Species Concept, these two outcomes of a hybrid zone do not result in speciation.
What are fusion and stability?
These prezygotic barriers are more related to natural selection than to sexual selection.
What are habitat, temporal, and gamete isolation?
One of the postzygotic barriers only reduces this word but does not eliminate it.
What is fitness?
This is the key mechanism by which an allopolyploid can restore fertility.
What is chromosome doubling?