Question

A new species is formed from existing population when

• A. It is geographically isolated.
• B. It has different size of genitalia.
• C. It has different mating time.
• D. It has seasonal variations.

Answer 1

The correct option is A It is geographically isolated.

Geographic isolation: In the fruit fly example, some fruit fly larvae were washed up on an island and speciation started because populations were prevented from interbreeding by geographic isolation. Scientists think that geographic isolation is a common way for the process of speciation to begin. Rivers change course, mountains rise, continents drift, organisms migrate and what was once a continuous population is divided into two or more smaller populations. So, a new species is formed from existing population when it is geographically isolated and not by different size of genitalia, different mating time and seasonal variations.

Therefore, the correct answer is option A.