Embryology and GeneticsDevelopment and genetics. The egg and the spermatozoon. Cleavage of the egg. Gastrulation. Half and whole embryos. The development of Egg fragments. Single embryo from two eggs. Twins and twinning. Multiple chromosome types. Protoplasm and genes. Larval and foetal types. Parthenogenesis. Regeneration. Localization and induction. The determination of sex. Physiological embryology. |
Contents
Introduction | 3 |
Development and Genetics II | 11 |
The Egg and the Spermatozoön | 18 |
Copyright | |
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adult animals appear archenteron balance become beginning blastomeres blastula called carry cells changes character chemical chromosomes cleavage concerned contain crescent determined differentiation diploid direction divide division double early ectoderm effect embryo embryology enters evidence example experiments explain fact female fertilization follows four gametophyte gastrula genes genetic germ gill give given graft groups half halves head hybrid individual inner involved kind known larvae later layer male materials means membrane neural plate normal nucleus observations organs original outer ovary pair pass physical piece plane polar polar bodies pole position possible present problem produce protoplasm regeneration region relation remains removed sea urchin separate shown side similar single species sperm spermatozoön spindle stage structure surface tail takes place tion tube turned twins wall whole yolk young