The phenomenon of seasonal dimorphism is of especial moment for the plankton dwellers.
After this a marked sexual dimorphism sets in.
Mercuric iodide also exhibits dimorphism.
In some species of Dinophilus there is pronounced sexual dimorphism (the male being small and without gut) as in the Rotifera.
His investigation (also in 1826) of the two crystalline modifications of sulphur threw much light on the fact that the two minerals calc-spar and aragonite have the same composition but different crystalline forms, a property which Mitscherlich called dimorphism.
Module 3: Evolution of Sex & Genetic Conflict Many animals, and some dioecious plants, show striking dimorphism between males and females.
What we are looking at here, in effect, is sexual dimorphism rather than gender.
Moreover, this is nullified by extreme sexual dimorphism.
The most stable size dimorphism is in the size of the canines, which is pronounced in all studied samples.
dioecious plants, show striking dimorphism between males and females.
One of the most interesting features of ant-societies is the dimorphism or polymorphism that may often be seen among the workers, the same species being represented by two or more forms. Thus the British " wood ant " (Formica rufa) has a smaller and a larger race of workers (" minor " and " major " forms), while in Ponera we find a blind race of workers and another race provided with eyes, and in Atta, Eciton and other genera, four or five forms of workers are produced, the largest of which, with huge heads and elongate trenchant mandibles, are known as the " soldier " caste.
Cross pollination is often favoured by dimorphism of the flower, as shown in species of Primula (fig.
The iris is in most young birds at first brown or dull-coloured, but with maturity attains often very bright tints which add considerably to the charm of the bird; sexual dimorphism is in this respect of common occurrence.
Molluscs are usually of separate sexes, but sexual dimorphism is seldom highly developed.
skua, is not known to exhibit the remarkable dimorphism to which the two preceding are subject.
In association with antimonious and arsenious sulphides, silver sulphide forms many important minerals, which sometimes present dimorphous forms, reflecting the dimorphism of silver sulphide; moreover, the corresponding arsenious and antimonious compounds are frequently isomorphous.
Where the sexes are distinct, a more or less marked dimorphism often exists.
Dimorphism or heterophylly is fairly common.
Dimorphognathus, from West Africa, is the unique example of a sexual dimorphism in the dentition, the males being provided with a series of large sharp teeth in the lower jaw, which in the female, as in most other members of the family, is edentulous.
To allure and attract them to visit the flower the odoriferous secretions and gay colours are developed, and the position and complicated structure of the parts of the flower are adapted to the perfect performance of the process, It is comparatively rare in hermaphrodite flowers for self-fertilization to occur, and the various forms of dichogamy, dimorphism and trimorphism are fitted to prevent this.
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