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The highest frequencies of viable progeny were obtained when B. napus was the maternal parent of the interspecifichybrid and the first backcross.
2
The excellent chromosome morphology of these diploid species allows detailed cytological analysis of interspecifichybrids.
3
Unexpectedly, heterosis for protein abundance was strongly biased toward positive values in interspecifichybrids but not in intraspecific hybrids.
4
That occasional cross-pollination occurred not only between individuals of the same species, but also between related species to produce interspecifichybrids.
5
A better understanding of the evolutionary forces that shape regulatory variation and divergence can be developed by comparing expression differences among species and interspecifichybrids.
6
Even though behavioural, genetic and ecological factors uphold species boundaries in ducks, we detect opposing forces allowing for viable interspecifichybrids, with long-term evolutionary implications.