Why is geographical isolation more effective in speciation when the time period is long?
Answer and explanation
Correct answer: Because genetic changes take many generations to accumulate
Geographical isolation separates populations and reduces interbreeding and gene flow. Evolutionary differences usually arise through many small changes, including mutation, recombination, drift and selection, rather than appearing in one generation. Over many generations these differences can accumulate and produce reproductive isolation, making speciation more likely. Therefore A is correct. B and C describe impossible instant events, while D contradicts the role of geographical isolation.
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What is the correct answer to this question?
Because genetic changes take many generations to accumulate
Why is this the correct answer?
Geographical isolation separates populations and reduces interbreeding and gene flow. Evolutionary differences usually arise through many small changes, including mutation, recombination, drift and selection, rather than appearing in one generation. Over many generations these differences can accumulate and produce reproductive isolation, making speciation more likely. Therefore A is correct. B and C describe impossible instant events, while D contradicts the role of geographical isolation.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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