Titlebook: Developmental Biology and Pathology; A. Gropp (Professor Dr.),K. Benirschke (Professor Conference proceedings 1976 Springer-Verlag Berlin

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School Representation in Curriculum Policiestrict ovarian hormonal control; hormones emanating from the blastocysts themselves are probably also involved, as it has been shown that blastocysts contain several steroid hormones (. and ., 1972) and a gonadotropin type of hormone (. and ., 1974;., unpublished).

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Autosomal Monosomy and Trisomy Causing Developmental Failurey enhance meiotic nondisjunction (. et al., 1970; . and ., 1970; . and ., 1973). Chromosomally hypo- or hypermodal gametes, which are responsible for (whole arm) monosomy or trisomy of the embryo, are produced as a consequence of irregular meiotic segregation.

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Conference proceedings 1976e processes of germination of the fIrst tender buds of life. Moreover, developmental biology encompasses a very large part of biology; if broadly dermed - almost all of it. The same is true for the fIeld of pathology if the manifold possibilities of disorders of the orderly arranged pathways of deve

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Developmental Anomalies Arising from Errors of Fertilization and Cleavagemerous points at which irregularities can occur. Errors of fertilization can also arise from anomalies in spermatozoa (and ., 1973, adduces evidence that indeed most spermatozoa are abnormal), and so sperm maturation contributes a further quota of intricacy to the picture. Additional possibilities a

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Oocyte Maturation and Paternal Contribution to the Embryo in Mammalsoocyte maturation. This maturation, which is under the influence of gonadotrophins, is a prerequisite for rendering an oocyte fertilizable by a spermatozoon. Whether the subsequent cleavage and development is normal relies heavily on the existence of cortical granules and on the secretion of their c

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