Specifically, I'm asking about infertile hybrids like ligers, mules, camas, etc. How closely related do animals need to be?

  • $\begingroup$ Related just enough? There probably isn't a single answer across taxa. $\endgroup$ – kmm Nov 25 '18 at 2:44
  • $\begingroup$ "The number of quantitative trait loci fixed for different alleles in different species should increase with time since speciation" (Genetic distance between species predicts novel trait expression in their hybrids). I suppose that the genetic distance of hybrid parents may be larger in plants than in animals. $\endgroup$ – Olga Świder Nov 26 '18 at 10:36

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