EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a. all similar individuals.
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b. including all interbreeding populations within a group.
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c. members of natural populations that interbreed
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d. including all members of actual or potentially interbreeding populations that are reproductively isolated from other groups
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*d. including all members of actual or potentially interbreeding populations that are reproductively isolated from other groups.Feedback:Yes. The BSC as defined by Dobzhansky includes all members of actual or potentially interbreeding populations that are reproductively isolated from other such groups.
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Detailed explanation-1: -The most widely applied criterion for distinguishing species is the Biological Species Concept (BSC), which defines species as groups of interbreeding individuals that remain reproductively isolated from other such groups.
Detailed explanation-2: -Biological species concept. In nineteen century the first who produced the most quoted definition of what he called “biological species” was the zoologist Mayr (1942) who defined species as: “groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups”.
Detailed explanation-3: -Speciation, or the process that results in new species, occurs when an ancestral population splits into two or more descendant species which are genetically distinct and unable to interbreed (per the biological species concept). Speciation is all about gene flow-or lack thereof.
Detailed explanation-4: -One of the more commonly accepted species concepts is the Biological Species Concept (BSC) proposed by Ernst Mayr (57). Mayr proposed that a biological species is comprised of groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups (57).