Besitzt eine der beiden Stammarten nur dominirende Merkmale, dann ist die Hybride von derselben kaum oder gar nicht zu unterscheiden.
If one of the two parent-species only possesses dominating traits, then the hybrid is barely distinguishable from it, or not at all.
dominating = dominirende See p. 10, s. 14.
barely = kaum As in p. 18, s. 8, Mendel seems to formulate a tendency here. In this case, however, it is likely that he has in mind hybrid characters that do not appear in either of the two parental types, such as the dotted seeds mentioned on p. 11, s. 14.
parent-species = Stammarten Both Bateson and Sherwood have “parental types”; see p. 5, s. 10.