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Extra-pair copulation without apparent direct benefits is an evolutionary puzzle that requires indirect fitness benefits to females to explain its ubiquity in socially monogamous mating systems. Using wild scarlet rosefinches (Carpodacus erythrinus), we tested if genetic benefits in the form of global (microsatellite) heterozygote advantage, adaptive genes (major histocompatibility complex), or complementary...
Both genome‐wide heterozygosity and heterozygosity at major histocompatibility complex (MHC) genes are often associated with higher fitness. Recent theoretical work indicates that sexual ornaments may reveal information about individual heterozygosity, and that preference for such ornaments may benefit females via the increased heterozygosity of their progeny. Here, we used path analysis to investigate...
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