Speciation Worksheet
Explore the processes and mechanisms of speciation, including different modes and reproductive isolation, for Grade 12 Biology students.
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Topics
Speciation: The Formation of New Species
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Read each question carefully and provide detailed answers based on your understanding of speciation. This worksheet covers different modes of speciation and reproductive isolation mechanisms.
1. Which of the following defines speciation?
The process by which individuals adapt to their environment.
The formation of new and distinct species in the course of evolution.
The extinction of species due to environmental changes.
The migration of species to new geographical locations.
2. Allopatric speciation occurs when populations are:
In the same geographical area but occupy different niches.
Geographically separated.
Interbreeding freely.
Undergoing hybridization.
1. Reproductive isolation mechanisms prevent members of different species from and producing fertile offspring.
2. Sympatric speciation occurs when new species arise from a population that lives in the same area.
3. A barrier, such as a mountain range or a river, can lead to allopatric speciation.
1. Prezygotic barriers prevent the formation of a zygote.
True
False
2. Hybrid breakdown is a type of prezygotic barrier.
True
False
1. Briefly explain the difference between allopatric and sympatric speciation.
2. Give an example of a postzygotic reproductive barrier and describe its effect.
The diagram below illustrates different modes of speciation. Refer to it to answer the following questions.
3. Based on the diagram, describe the main characteristic that distinguishes parapatric speciation from allopatric speciation.
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