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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
q what are the cells produced in the first stage of the embryonic development calledthe cells that result from the cleavage the first stage of the
q what is the cell division during the first stage of the embryonic development called how is this stage characterizedthe cell division in the first
q what are the four initial stages of the embryonic developmentthe four early stages of the embryonic development are the blastula stage the morula
q what are the animal pole and the vegetal pole of the vertebrate eggthe animal pole of a telolecithal egg is the portion of the egg with little
q what is the function of the vitellus in the vertebrate egg how are these eggs classified according to the amount of vitellus within themvitellus
q what is the cell division process directly related to the embryonic growththe embryonic growth depends directly on mitosis through this kind of
q what is parthenogenesisparthenogenesis is the formation or reproduction of a new individual from the egg cell but without fecundation by the male
q generally how does a male animal realize that the female is receptive to copulationin most vertebrate species with internal fecundation the females
q what is the contraceptive mechanism of the iudthe iud intrauterine device is a piece of plastic coated with copper that is put-in within the uterus
q how is the ovulation date estimated with the control of the womans body temperatureone method to estimate the exact ovulation day is daily control
q what is the normal duration of the menstrual cycle how does the calendar contraceptive method workthe normal duration of the menstrual cycle is 28
q why is the use of condoms not just a contraceptive method but also a health protection behaviorthe use of condoms besides being an efficient
q how does the contraceptive diaphragm work what are the limitations of this contraceptive methodthe contraceptive diaphragm is an artifact made of
q what are the most common methods of female and male surgical sterilizationvasectomy is the majority common method of surgical sterilization in men
q what are the common contraindications of the contraceptive pillsthere are medical reports associating the use of contraceptive pills with vomiting
q how do contraceptive pills generally workcontraceptive pills generally contain the hormones progesterone and estrogen if taken daily from the 4th