Question

If a trait X exists in 10% of the population of an asexually reproducing species and trait Y exists in 70% of the same population. Among X and Y which trait is likely to have arisen earlier.

• A. X
• B. Y
• C. Both the traits have arisen simultaneously
• D. None of the above

Answer 1

The correct option is B Y

If a trait is present in only 10% of the population it is more likely to have arisen recently. Since it arose recently in the population it got less time to replicate itself in the individuals. Hence, it is present in only a limited fraction of population. On the other hand, trait Y which is present in 70% of the population arose earlier. The trait got more time to replicate and so is present in a wider population.