Polymorphic species may now be regarded as the link which unites ordinary variability with the historical production of species.
We now understand the process by which a polymorphic race maintains its polymorphism.
Darwin simply states that this kind of variability seems to be of a peculiar nature; since polymorphic species are now in a stable condition their occurrence gives no clue as to the mode of origin of new species.
The experiment was a fair one, inasmuch as it demonstrated the polymorphic variability of cereals beyond all doubt and in a degree hitherto unsuspected; but from the standpoint of the selectionist it was a failure.
The male of a polymorphic mimetic female is, in fact, usually non-mimetic (e.
But it is polymorphic variability in the strictest sense of the word.
Species which are uniform in some localities may bepolymorphic in others.
Commenting on his results Rosen argues that the polymorphic group commonly called by systematists Erophila (Draba) verna may now be regarded as having arisen by crossing, as did his own types mentioned above.
An interesting case has recently been brought forward by Carpenter[81] and explained on these lines: The Nymphaline Pseudacraea eurytus is a polymorphic species found in Central Africa.
This case of the polymorphic Pseudacraea eurytus is one of the greatest interest, but it would be hazardous to draw any far-reaching deductions from such facts as are known at present.
More recently they have been shewn to be forms of the polymorphic species, Pseudacraea eurytus.
Or, more briefly, cyclically acting causes of change produce cyclically recurring changes: under their influence series of monomorphic generations become formed into a cycle of di- or polymorphic generations.
Cases of polymorphic mimetic females may for the present be excluded, in order to reduce the argument to its greatest simplicity.
It is shown by those species in which only one stage is di- or polymorphic that not every change in the one stage entails a corresponding change in the other.
The rich material of the Challenger revealed this family as very polymorphic and widely distributed, so that in my Prodromus (1881, p.
The genus Heliodiscus, the most common and polymorphic of all #Phacodiscida#, was founded by me in 1862 as the first known type of this family (loc.
Panicum, a very polymorphic genus, and one of the largest in the order, is widely spread in all warm countries; together with species of Paspalum they form good forage grasses in the South American savannas and campos.
Panicum Crus-galli is a polymorphic cosmopolitan grass, which is often grown for fodder; in one form (P.
In most polymorphic genera some of the species have fixed and definite characters.
Genera which are polymorphic in one country seem to be, with some few exceptions, polymorphic in other countries, and likewise, judging from Brachiopod shells, at former periods of time.
We have, therefore, to inquire what are the conditions under which different polymorphic forms can coexist, either alone or in presence of the liquid and vapour phase.
That was a {202} consequence of the fact that the two polymorphic forms on melting gave identical liquid phases.
In the case of sulphur and tin, we have met with two substances existing in polymorphic forms, and we have also learned that these forms exhibit a definite transition point at which their relative stability is reversed.
Attention has already been drawn to the sluggishness with which reciprocal transformation of the polymorphic forms of a substance may occur.
In the case of polymorphic substances, we have seen (p.
Genera which are polymorphic in one country seem to be, with a few exceptions, polymorphic in other countries, and likewise, judging from Brachiopod shells, at former periods of time.
Papilio Memnon is one of the most striking, as it exhibits the mixture of simple variability, local and polymorphic forms, all hitherto classed under the common title of varieties.
Defn: One of the asexual polymorphic forms of white ants, or termites, in which the head and jaws are very large and strong.
Note: They are very abundant in tropical countries, and are noted for their destructive habits, their large nests, their remarkable social instincts, and their division of labor among the polymorphic individuals of several kinds.
The variations have lead authors to divide thispolymorphic species into several species and varieties.
In a general study it is best to include the polymorphic forms under one name.
They are very abundant in tropical countries, and are noted for their destructive habits, their large nests, their remarkable social instincts, and their division of labor among the polymorphic individuals of several kinds.
One of the asexual polymorphic forms of white ants, or termites, in which the head and jaws are very large and strong.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "polymorphic" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: manifold; metamorphic; multifarious; multifold; multiple; protean
