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q which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo is this function present in placental mammalian
q how is the yolk sac formed what is the function of the yolk sacthe yolk sac is formed from the covering of the vitellus by few cells originated
q are the extraembryonic membranes the same in all vertebratesthe presence of each extraembryonic membrane differs according to the vertebrate
q what are the extraembryonic membranes present in vertebratesthe extraembryonic membranes that may be present in vertebrates are the yolk sac the
q what are extraembryonic membranesextraembryonic membranes are membranous structures that appear in parallel with the embryo and play vital roles in
q what is polyembryonypolyembryony is the phenomenon in which a single embryo in its initial embryonic stage divides itself forming many new
q what are twins genetically what are the two types of twins that can be generatedtwins are at the same time generated within the mothers uterus
q from which germ layer do the liver and the pancreas originate what are other organs and tissues made from that germ layerthe pancreas and the liver
q from which germ layer do blood cells originate what are other organs and tissues made from that germ layerblood cells have a mesodermal embryonic
q from which germ layer do the epidermis and the nervous system originate what are other organs and tissues made from that germ layerepidermis and
q what are organogenesis and histogenesishistogenesis is the procedure of tissue formation in the embryonic development organogenesis is the
q what do you mean by somitessomites are differentiated portions of mesodermal tissue longitudinally distributed along the embryo and the somites
q after the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be describedin a schematic longitudinal
q what are pericardium pleura and peritoneumpleura are the membrane that covers the inner wall and the lungs of the chest pericardium are the
q what is the germ layer from which the coeloms originatethe coeloms are deriving from
q what is the coelom to which structures do coeloms give birth are all animals coelomatecoeloms are cavities delimited by mesoderm and coeloms
q what is the notochord how is this structure formedthe notochord is a rodlike structure that outlines the supporting axis of the embryo and gives
q how does the embryo turn from gastrula into neurula how is the neural tube formed what is the embryonic origin of the nervous system in
q how are animals classified according to the germ layers present in their embryonic developmentcnidarians are diploblastic that is they present only
q what are the three types of germ layers that form tissues and organs in animalsthe three germ layers are the mesoderm the ectoderm and the
q how is the mesoderm third germ layer of triploblastic animals formedthe mesoderm shows from differentiation of endodermal cells that cover the
q what are the archenteron and the blastopore what is the stage of the embryonic development in which these structures are formed what are the
q what is gastrulation how during gastrulation are the first two germ layers formed what are these germ layersgastrulation is the process through
q after the blastula stage what is the following stage of the embryonic development what is the passage from blastula to the next stage calledthe
q after the morula stage what is the next stage what is the morphological feature that defines this stagein the blastula stage the compactness is