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TASBiologyQuick questions
Unit 4: Change Over Time
Quick questions on Speciation - TCE Biology (Tasmania)
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the general process of speciation?Show answer
Speciation usually follows a sequence:
What is allopatric speciation?Show answer
Allopatric speciation happens when a physical (geographic) barrier separates populations. The barrier might be a mountain range, a river, an ocean, or new land formed by geological change. With gene flow blocked, the two populations evolve independently. This is thought to be the most common form of speciation.
What is sympatric speciation?Show answer
Sympatric speciation happens without geographic separation, while populations still share the same area. Gene flow is interrupted by biological factors instead. Examples of how this can occur include:
What are isolating mechanisms?Show answer
Once divergence begins, isolating mechanisms keep gene pools separate. They are grouped by whether they act before or after mating.
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