By Professor Dr. Ernst Hadorn (auth.)
Although this can be primarily a translation of the second one German variation released in 1970, more moderen experimental findings have, in numerous situations, been integrated into the textual content. additionally, now we have attempted to provide an explanation for many of the experiments, and their attainable interpretations, in a extra particular manner. i'm very thankful to Dr. David Turner; as well as translating the textual content, he used to be capable, due to his adventure in developmental biology, to indicate a few advancements during our collaborative discussions. Zurich, Spring 1974 ERNST HADORN Preface to the second one German variation The tenet of the 1st version continues to be in strength. that's, the tools and result of developmental study are intro duced anywhere attainable by using experiments on am phibians. even though, the scope of the cloth has been considerably ex panded in newly brought chapters at the migrations and affinities of somatic and germ cells in addition to at the motion of genetic components in early improvement. those are fields of analysis that are on the heart of trendy study. additionally, various new findings were included into the textual content. the writer hopes that this little e-book will proceed to facilitate realizing of fascinating learn difficulties, for the layman in addition to for the trainer and scholar of biology.
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Sample text
Under the influence of the gonadotropic hormones of the hypophysis (p. 23 4), the gonads increase in size during this youthful phase and the germ cells develop into mature, fertile, gametes. At the beginning of this process the germ cell nuclei of the newt, like the somatic cell nuclei, have twenty-four chromosomes, of which twelve are derived from the mother and twelve from the father. The chromosome complement is thus diploid-composed of two paired sets (Fig. 5g). During the process of germ cell maturation (gametogenesis) the chromosome number is reduced by half (cf.
Movement continues until the ectoderm cells forming the skin primordium have assembled on the outside, the cells of mesodermal musculature or notochord primordium have assumed an intermediate position, and the gut-forming endoderm cells have located themselves at the center. But can we now understand this kind of behavior which produces order out of chaos? There has been a continuing effort on the part of many researchers to clarify and explain this remarkable restructuring capability of dissociated cells.
9a): p= 1/4 for homozygous onu/onu individuals; p= 1/2 for heterozygotes (onu/ +); and p= 1/4 for homozygous normals (+ / +). Individuals of the onu/onu class form no nucleoli (Fig. 9b), the onu/+ individuals form a single nucleolus (Fig. 9 c), and the homozygous normal individuals form two nucleoli per cell. Figs. ge through 9g show that elaboration of the nucleolus proceeds from a distinctly constricted region called the "nucleolus organizer", located on one of the eighteen chromosomal pairs to be found in Xenopus nuclei.
