posted by beena on .
If a trait A exists in 10% of the population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait would have arisen earlier?
As a general rule, the greater the percentage of a population that shares a trait, the longer that trait has been in existance. Think of an epidemic of the flu. If ten people have it in one school and sixty people have it in another, which school do you think has been infected longer?