Mechanisms of speciation
6 important questions on Mechanisms of speciation
Organisms such as prokaryotes (bacteria and archaea)―along with some eukaryotes―reproduce asexually. In the case of bacteria and archaea in particular, which exchange DNA but do not reproduce utilizing conventional sexual reproduction, the best way in which to define species is with...
- the morphospecies concept
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- the phylogenetic species concept
- the biological species concept
- an ecological species concept
There are two closely related populations of squirrels living in the Grand Canyon area―one lives on the north rim, the other lives on the south rim. Speciation in these squirrels best fits which model?
- dispersive allopatric speciation
- dispersive sympatric speciation
- vicariant allopatric speciation
- vicariant sympatric speciation
Which of the following models of speciation hinges on a physical barrier which prevents gene flow between populations?
- dispersive allopatric
- dispersive sympatric
- vicariant allopatric
- vicariant sympatric
vicariant allopatric
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Your textbook authors make the claim that "sympatric species with matching chromosome numbers are rare." Why is this?
- because allopatric speciation is far more common
- because sympatric speciation has only been hypothesized but not documented
- because coexisting populations need a boundary to gene flow before divergence can occur, and differences in chromosome numbers provide this
- because macroevolution is just a theory
Isolating mechanisms leading to speciation have been documented by...
- geographic isolation
- polyploidy
- temporal isolation
- a mutation in a single gene
geographic isolation
polyploidy
temporal isolation
a mutation in a single gene
Selection that reduces the frequency of hybridization and/or the fitness of hybrids between populations following secondary contact is termed...
- postzygotic isolation
- sexual selection
- reinforcement
- allopatry
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