If two populations remain separated for a long time and do not interbreed, what result is possible?
Answer and explanation
Correct answer: They may become different species
Long-term reproductive isolation stops or greatly reduces gene flow between populations. Once separated, mutation, recombination, genetic drift and natural selection can act differently in the two environments. Differences may accumulate until the populations can no longer produce fertile offspring with one another, a condition associated with separate species. Thus A is a possible result. The other options incorrectly claim instant identity, chromosome loss or a complete absence of change.
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What is the correct answer to this question?
They may become different species
Why is this the correct answer?
Long-term reproductive isolation stops or greatly reduces gene flow between populations. Once separated, mutation, recombination, genetic drift and natural selection can act differently in the two environments. Differences may accumulate until the populations can no longer produce fertile offspring with one another, a condition associated with separate species. Thus A is a possible result. The other options incorrectly claim instant identity, chromosome loss or a complete absence of change.
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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