How does geographical isolation help in speciation?
Answer and explanation
Correct answer: It reduces gene flow between separated groups
Geographical barriers such as mountains, rivers, or large distances can prevent members of one population from mating with members of another. Gene flow therefore decreases, while mutation, recombination, drift, and natural selection may cause the separated groups to diverge. If reproductive isolation eventually develops, speciation can occur. Thus option A is correct; isolation does not stop mutations, make organisms identical, or instantly create fossils.
Frequently asked questions
What is the correct answer to this question?
It reduces gene flow between separated groups
Why is this the correct answer?
Geographical barriers such as mountains, rivers, or large distances can prevent members of one population from mating with members of another. Gene flow therefore decreases, while mutation, recombination, drift, and natural selection may cause the separated groups to diverge. If reproductive isolation eventually develops, speciation can occur. Thus option A is correct; isolation does not stop mutations, make organisms identical, or instantly create fossils.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Evolution and speciation.
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