Multiple Choice
When plants undergo allopatric speciation, an initial reproductive barrier is often:
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23. Speciation
Introduction to Speciation
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Which term describes the formation of a new species from an existing species, typically occurring in two phases?
A
Hybridization
B
Extinction
C
Mutation
D
Speciation
Verified step by step guidance1
Understand the concept of speciation: Speciation is the evolutionary process by which populations evolve to become distinct species. It typically involves the splitting of one species into two or more genetically distinct species.
Recognize the two main phases of speciation: (1) Genetic isolation, where populations of the same species become separated (e.g., by geographic barriers or reproductive isolation), and (2) Divergence, where genetic differences accumulate over time due to mutation, natural selection, or genetic drift.
Differentiate speciation from other terms: Hybridization refers to the interbreeding of two different species, extinction is the complete disappearance of a species, and mutation is a change in the DNA sequence. None of these terms describe the formation of a new species.
Relate the term 'speciation' to the question: Speciation specifically describes the formation of a new species from an existing one, aligning with the process described in the question.
Conclude that the correct term for the process described in the question is 'Speciation,' as it matches the definition and phases outlined above.
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