With the beginning of secondary contact, the island population receives migrants from the mainland. (journals.plos.org)
Their comparisons revealed a relationship between genetic traits that are most important in evolution during isolation and those that are most important during secondary contact, with greater - than - expected overlap between genes in these two scenarios. (sciencedaily.com)
Before secondary contact is established, the island population consists of individuals of genotype AiAiBiBi. (journals.plos.org)