Exploring the genomic landscape of gene flow between willow warblers (Phylloscopus trochilus) and chiffchaffs (P. collybita)
Hybridisation and subsequent backcrossing allows alleles to migrate between populations in a process known as ‘gene flow’. This provides an alternative source of new alleles for a population, meaning that gene flow can give rise to new adaptive phenotypes. Consequently, to understand the evolution of a given phenotype, the possibility that the underlying alleles have been introgressed from another
