Multiple Choice
Which of the following does NOT tend to promote speciation?
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23. Speciation
Introduction to Speciation
Multiple Choice
How did the original population that became two descendant species first become separated?
A
By the extinction of all intermediate forms
B
By random mating within the entire population
C
By a geographic barrier such as a mountain range or river
D
By a sudden mutation in a single individual
Verified step by step guidance1
Understand the concept of speciation: Speciation is the process by which one species splits into two or more distinct species. This often begins with the separation of a population into isolated groups.
Recognize the role of geographic barriers: Geographic barriers, such as mountain ranges, rivers, or oceans, can physically separate populations, preventing gene flow between them. This is known as allopatric speciation.
Consider the impact of isolation: Once populations are geographically isolated, they may experience different environmental pressures, leading to natural selection, genetic drift, and mutations that cause them to diverge genetically over time.
Eliminate incorrect options: Extinction of intermediate forms does not explain how the original population became separated. Random mating within the entire population would not lead to separation. A sudden mutation in a single individual is unlikely to create two distinct species.
Conclude that geographic barriers are the most plausible explanation: The separation of the original population into two groups by a geographic barrier is the correct mechanism that could lead to the formation of two descendant species.
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