Speciation
Biology ⇒ Evolution and Diversity
Speciation starts at 9 and continues till grade 12.
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Describe how behavioral isolation can contribute to speciation.
Describe how ecological niches can drive speciation.
Describe how founder effect can contribute to speciation.
Describe how sexual selection can contribute to sympatric speciation.
Describe the concept of adaptive radiation and its relationship to speciation.
A population of insects is split by the construction of a highway, resulting in two groups that cannot cross to interbreed. Over several generations, one group evolves resistance to a pesticide while the other does not. Explain how this scenario could lead to speciation, and identify the type of speciation involved.
A researcher observes that two populations of frogs living in adjacent but slightly different habitats have developed distinct mating calls. Occasionally, individuals from the two populations interbreed, but the resulting hybrids have lower fitness. What evolutionary process is likely occurring, and what is the expected long-term outcome?
Explain how hybrid zones can provide evidence for the process of speciation, and describe what outcomes are possible for populations in a hybrid zone.
Which of the following best defines speciation? (1) The process by which new species arise (2) The extinction of a species (3) The adaptation of a species to its environment (4) The migration of a species to a new area
Which of the following best describes parapatric speciation? (1) Occurs in completely isolated populations (2) Occurs in populations with overlapping ranges (3) Occurs in adjacent populations with limited contact (4) Occurs only in plants
Which of the following is a likely outcome if two populations are separated for a long period? (1) They become more genetically similar (2) They remain identical (3) They may evolve into separate species (4) They will always go extinct
Which of the following is a prezygotic barrier? (1) Hybrid sterility (2) Gametic isolation (3) Hybrid breakdown (4) Hybrid inviability
Fill in the blank: ________ isolation occurs when two species breed at different times of the year.
Fill in the blank: The formation of a new species due to a chromosomal mutation within a single population is called ________ speciation.
Fill in the blank: The inability of two species to produce fertile offspring is known as ________.
Fill in the blank: The process by which a single species evolves into several different forms that live in different ways is called ________ radiation.
True or False: Allopatric speciation requires geographic isolation.
True or False: Gene flow between populations increases the likelihood of speciation.
True or False: Hybrid inviability is a prezygotic barrier.
True or False: Hybrid zones are regions where two species meet and interbreed, producing hybrid offspring.
