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Understanding how genetic variation at individual loci contributes to adaptation of populations to different local environments is an important topic in modern evolutionary biology. To date, most evidence has pointed to conditionally neutral quantitative trait loci (QTL) showing fitness effects only in some environments, while there has been less evidence for single‐locus fitness trade‐offs. At QTL...
We examined the level of postzygotic reproductive isolation in F1 and F2 hybrids of reciprocal crosses between the Arabidopsis lyrata subspecies lyrata (North American) and petraea (European). Our main results are: first, the percentage of fertile pollen was significantly reduced in the F1 and F2 compared to the parental populations. Second, mean pollen fertility differed markedly between reciprocal...
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