An example of direct developmental inheritance--in terms of deterioration--from father to daughter.
Her developmental arrest and her disabilities (resulting from an intensification of Recessive processes in her) are seen now to have subserved a phase of higher evolution.
The conjugal and the paternal instincts being traits the sex has acquired by long ages of developmental progress, for men to lose these would be as easy as the loss would be degenerative to themselves and to those others.
This male organism energises both its developmental and its functioning power, and fertilises it; although the potential of structure, of growth, of function and of reproduction are engendered in the female organism.
Its powers thus handicapped by requiring to engender the vital potential and the developmental power to equip it with two orders of implement, neither order has attained perfection of construction or of function.
Healthy children are inevitably delicate children, because of that highly-sensitive re-activity to surroundings which not only characterises but conduces to thedevelopmental state.
Her arrest of development along lines of masculine inherence no more proves her inferior to the male than does the human developmental arrest along lines of that tail our ape-progenitor possessed, prove the human inferior to the ape-species.
Shire horses are typical examples of Vigour, or developmental power, expressed in terms of stature, muscle and nervous energy.
And she was a great cow because she received from her sire a great male complement of developmental power, which imparted to her Recessive, and undifferentiated Femaleness, further power of functioning as female characteristics.
Because the Dominance, or Male developmental power, of the Recessives being inhibited by the Recessiveness, or Femaleness, in them, is of low Vigour.
In certain diseases, such as rickets and inherited syphilis, and in developmental anomalies such as achondroplasia, dwarfing of the skeleton results from defective growth of bone at the ossifying junctions.
To disentangle such parts of their developmental changes as are due to the action of the medium, is therefore hardly possible.
Evidently, then, the current statement which ascribes the developmental progress to differentiations alone, is incomplete.
The origin of this is seen in types where the developmental process is not obscured by the presence of a large food-yolk.
Growth rate in turn depends largely on body size and developmental type.
Nevertheless, environmental impact statements on proposed developmental programs in the North still raise more questions than are being answered.
The energy in the egg is contained mainly in the yolk, and yolk size depends largely on the developmental pattern shown by the young after hatching (Table 3).
Incubation The total time devoted to incubation does not depend directly on developmental type or egg size but differs markedly among families (Lack 1968).
Species characteristics such as clutch size, egg and yolk size, developmental type, growth rate, food type, and behavior combine with environmental variables to make seabirds a very diverse group in time and energy budgeting.
Adaptive significance of post-hatching developmental patterns and growth rates in alcidae.
This is only what would be expected when it is remembered that the developmental changes never cease.
Using the word in this restricted sense, it is pointed out in the same article that the developmental period frequently presents two phases, the embryonic and the larval.
It does not seem to be attracted to large trees such as cottonwoods, but seems to prefer the more leafy shrubbery and small trees of developmental stages in ecological succession.
Locally it occurs in spruces of mature bog communities and in upland developmental forests of mixed pine and deciduous growth.
Hereditary tendencies, overtaxing the mental powers during the developmental period of youth, and later in life excessive mental labor and anxiety of business affairs, are causes.
And, lastly, as a consequence, that metamorphoses may be divided into two kinds, developmental and adaptional or adaptive.
It may be said that when Divine power created insects, they were created with these remarkable developmental processes.
That metamorphoses may therefore be divided into two kinds, developmental and adaptional or adaptive.
A clue to the difficulty may, I think, be found in the distinction between developmental and adaptive changes; to which I have called attention in a previous chapter.
Brauer[70] also considers that the vermiform larva is a more recent type than the Hexapod form, and is to be regarded not as a developmental form, but as an adaptational modification of the earlier active hexapod type.
The sexual cells are borne on the mesenteries in positions irrespective of obvious developmental radii.
The consideration of this relation of peritoneum and pancreas will profitably be deferred until we have studied the developmental changes in the region of the dorsal mesogastrium and great omentum.
It is doubtful if the above detailed developmental stages in man can ever be clearly comprehended unless the student will for himself examine the conditions and perform the manipulations in one of the lower mammals.
The earlier developmental stages of the higher mammalian embryos are in general well illustrated by the permanent adult conditions found in some of the lower vertebrates, in which development does not proceed beyond the primitive condition.
Moreover, in order to avoid confusing and unnecessary details it is often desirable to disregard developmental chronology entirely.
As the result of the developmental changes above outlined this straight line becomes bent at the point where the mesogastrium reaches the stomach (Fig.
The entire vertebrate body is the product of developmental changes taking place after fertilization in a single primitive CELL, the EGG or OVUM (Fig.
Many of the diagrams combine several successive developmental stages, showing different degrees of development in different portions of the same drawing.
There is no occasion for a “developmental force” to grope in the dark; if such a power exists, we should expect that it would add new characters to old ones with the precision of a master workman.
This question--does there exist a special “developmental force”?
Variation in a definite direction thus by no means necessitates the acknowledgment of a metaphysical developmental principle, but can be well conceived as the mechanical result of the physical constitution of the organism.
I shall commence, as in former cases, with the developmental history.
It is said that not only the most primitive languages in their last developmental stage, but also the more recent ones, even the living tongues of to-day have retained abundant remains of this primitive opposite meaning.
The researches on the mechanics of development by Roux and others have shown us that a needle prick into an embryonic cell mass which is undergoing division results in most serious developmental disturbances.
In fact, it is a developmental sequence, like that from the grub to the butterfly.
The fixation which we assume to exist towards specific developmental phases, conveys a meaning only if we think of it as stabilizing a definite amount of libidinous energy.
Similarly, on developmental grounds, the malleus or hammer of mammals is the homologue of the articular of birds, since both are developed from a portion of Meckel's cartilage identical in form and connections in the two groups.
Criticism of the Schwann-Schleiden theory from the zoological side was suggested by the study of the segmentation of the ovum--the developmental process in which the multiplication of cells is most easily observed.
Heterochrony shows itself, as a rule, either as an acceleration or as a retardation of developmental events, as compared with their relative time of occurrence during phylogeny.
Among the developmentalstages of various higher animals can be found some which correspond to the ancestral forms and also to the lower types which resemble these ancestral forms.
Their theory of recapitulation led them to conceive evolution as the developmental history of the one great organism.
The fourth Scholion elaborates the analysis of developmental processes still further, and discusses in particular the scheme of development which is shown by the Vertebrata.
In the former case the developmental history of descendants agrees with that of the ancestors only up to a certain point and then diverges.
Using the other method, the investigator traces back skull and vertebral column to their earliest embryonic states and determines the identity of parts by their developmental relations" (p.
The developmental theory of Darwin is not needed to enable us to understand the regular harmonious progress of the complete series of organic forms from the simpler to the more perfect.
Pelzeln has also objected that if the later organisms have proceeded from the earlier, the whole developmental series, from the simplest to the highest, could not now exist; in such a case the simpler organisms must have disappeared.
The object of each metamorphic or developmental epoch is a critical readjustment of the organism, in order to insure the greatest possible amount of health for each subsequent period of life.
Any recognition of truth must clearly embrace both the vital and material aspects of its subject in order to be adequately inclusive, that is, it should include the causative, the sustentative, the relational and the developmental factors.
During these years also the other great developmental force known as Environment has full play, the still plastic nature is moulded by circumstances, and the influence of these two forces is seen in the manner of individual that results.
Adolescence corresponds to the latter half of the developmental period, and may be prolonged even up to twenty-five years.
During these years Heredity, one of the two great developmental factors, bears its crop, and the seeds sown before birth and during childhood come to maturity.
That the health of adolescents should be unstable is what we ought to expect from the general instability of the organism due to the rapidity of growth and the remarkable developmental changes that are crowded into these few years.
Thus far the description bears out, in a measure, the theoretical notions entertained by the older authors; but the developmental process does not stop here.
At noon on the 30th I renewed my examination of the two large larvæ whose developmental changes I had been instrumental in producing from the time of their escape from the egg-coverings.
I need hardly remark that the developmental and structural changes undergone by these Cysticerci during their residence within the rabbit have been exhaustively followed out and treated of by Leuckart.
From a comparative pathologico-anatomical point of view, the developmental history of the aneurysma verminosum proves that a circumscribed endo-arteritis can determine the formation of an aneurism.
In this as well as in other respects the variety of different forms and of developmental variations is far greater than Buetschli (1882, loc.
The genus Semantidium exhibits a further developmental stage of the basal plate of the Semantida.
To speak of the developmental history of animals in terms of spaces; to speak of the atrophy of a cavity as though such a thing were possible, is, to my mind, the wrong way of looking at the facts of anatomy.
This appears to me exactly what the developmental process does show according to Goette's investigations.
The whole theory, then, is based upon a developmental stage of the vertebrate, and not upon the anatomy of the adult.
The Developmental Significance of the Human Physiognomy.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "developmental" in a variety of sentences. We hope that you will now be able to make sentences using this word.
