Influence of the large-Z effect during contact between butterfly sister species.

ABSTRACT: Recently diverged butterfly populations in North America have been found to exhibit high levels of divergence on the Z chromosome relative to autosomes, as measured by fixation index, Fst . The pattern of divergence appears to result from accumulation of incompatible alleles, obstructing introgression on the Z chromosome in hybrids (i.e., the large-Z effect); however, it is unknown whether this mechanism is sufficient to explain the data. Here, we simulate the effects of hybrid incompatibility on interbreeding butterfly populations using a model in which populations accumulate cross-incompatible alleles in allopatry prior to contact. We compute statistics for introgression and population divergence during contact between model populations and compare our results to those for 15 pairs of bu

SUBMITTER: Nelson ED 

PROVIDER: S-EPMC8427592 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature