There are certain hybrids which, instead of having, as is usual, an intermediate character between their two parents, always closely resemble one of them; and such hybrids, though externally so like one of their pure parent-species, are with rare exceptions extremely sterile.
eta hibridook, guraso-espezie garbietako bataren hain antzekoak izan arren, oso antzuak izaten dira, salbuespen bakanez. Normalean egituraz gurasoen bitartekoak diren hibridoen artean ere batzuetan banako aparteko eta anormalak jaiotzen dira, guraso garbi bataren antz handia dutenak;