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threshold value of different larval tissues threshold value of dissimilar larval tissues for the thyroid hormone concentrationone of the main
competence of larval tissue or multiple responses the responsiveness of different larval tissues to thyroxine is markedly different the tissues of
hormones in metamorphosis of amphibia in amphibians the changes that take place during metamorphosis are brought about by hormonal secretions of the
morphological changesregressive changes-these changes include the gradual reduction and ultimate disappearance of all those larval structures or
metamorphosis in amphibians metamorphosis is radical in anurans slight or not exists in urodeles in anuran amphibians like toads and most frogs
types of metamorphic changes the process of metamorphosis includes reactivation of the morphogenetic processes the morphogenetic changes also the
types of development of animalsdifferent animals have evolved various methods of development these methods can be broadly categorized into two
metamorphosisthe phenomenon of metamorphosis is described as a process during development which involves a remarkable change in morphology and
common features of eye and limb development a comparison of the embryonic development of the very much different organs the eyes and the limb points
role of cell deathas development of the limb proceeds waves of death or necrosis of large masses of mesodermal cells occur in certain regions at
zone of polarizing activity zpathe a-p axis is the 1st axis to be fixed in the presumptive limb mesoderm at a very early stage on the basis of
realization of p-d polarity of limbrealization of p-d polarity of limb expressed in a specified proximo-distal sequence of differentiation of limb
apical ectodermal ridge aerwe have described earlier that the aer persists at the tip until the last phalangeal cartilage begins differentiation the
role of mesoderm and ectoderm in limb morphogenesis a series of very interesting experiments on wing and leg buds of chick embryos have clarified the
pattern of limb development the first visible sign of limb development is the appearance of ridge or thickening on each lateral side of the embryo of
determination of limb polaritiesthe limb pattern is characterized by three axes or polarities as displayed in diagram 1 the direction from the
preference share capital or quasi-equityit is also called quasi-equity because it combines features of equity and those of debt it is preference
capital reserves1 this is raised with selling shares at a premium as the difference among the market price less floatation costs and par value is
vertebrate limb earlier we know that how a series of sequential and coordinated interactions between different cell groups and tissues carry about
lens - organogenesis of eye and limbthere is much experimental proof that the lens formation in many species is dependent on the induction by the
ordinary share capital this type of equity finance is raised from the public from the sale of ordinary shares to the shareholders this finance is
cornea - organogenesis of eye and limbthe fully formed cornea contains 2-cell layered epithelium and the stroma made of extra cellular secreted
retinaas invagination of the optic vesicle carries on to form the double walled optic cup the two layers of the optic cup start to differentiate in
categories of secondary inductionsthe secondary inductions are categorized into two types1 instructive interaction in such type of an interaction the