Exam 34: Mechanisms of Evolution

A geneticist is studying the prevalence of two alleles in a small, isolated population. He finds that many individuals are heterozygous and that across several generations there is little change in allelic frequency. The most likely reason for this result is

Which of the following species concepts cannot distinguish among species of lizards that reproduce solely by parthenogenesis?

Whether alleles increase, decrease or remain constant in a population is dependent on

A small population of wallabies lives on an island that was once connected to the mainland. Over many generations, several alleles have completely disappeared from the island population, although they are still present on the mainland. These alleles have probably disappeared due to