Which of the following does not generate genetic variation within a population?
mutations
geographic isolation
crossing over
sexual reproduction
A reproductive barrier that prevents interbreeding because the two species mate during different times of the year is called a
hybrid sterility isolation.
behavioral isolation.
F2 fitness isolation.
temporal isolation.A major difference between allopatric and sympatric speciation is whether
geographic isolation is required or not.
gene flow continues to occur or not.the new species are separated by a prezygotic or postzygotic isolating mechanism.
two or three species result.
During allopatric speciation there is a geographic barrier between areas that prevents gene flow between areas from occurring.
Sympatric speciation was initially considered to be much less common than allopatric speciation because if groups are occurring within the same area it seems likely that gene flow will occur between them, and this will tend to prevent speciation.Which of the following correctly shows a possible order of events resulting in allopatric speciation? temporal reproductive isolation - geographic isolation - natural selection
geographic isolation - natural selection - gametic reproductive isolation
natural selection - reproductive isolation - hybrid infertility
natural selection - temporal reproductive isolation - geographic isolation
C. geographic isolation-->natural selection-->prezygotic reproductive isolation
Allopatric speciation results when a species becomes separated due to geographic barriers which then result in the evolution of two or more separate species. Thus a geographic isolation has to occur first which results in separate natural selection stresses. Mutations would occur that would result in prezygotic reproductive isolation and the two species would therefore not be "compatible" both on a cellular level and ...er, anatomical level.
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