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
Development and Genetics | 11 |
The Egg and the Spermatozoön | 18 |
IV | 33 |
Copyright | |
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adult Amphioxus animals annelid antipolar appear Arch archenteron ascidian become Biol blastoderm blastomeres blastopore blastula changes character chorda chromo crescent determined dextral differentiation diploid divide division early ectoderm egg nucleus embryo embryology endoderm Entw.-mech enzymes evidence experimental experiments female fertilization fragments frog frog's egg gastrula genes genetic genic balance germ cells gill slits give rise graft groups half halves haploid hybrid individual inner intersexes invagination Jour kind larvae later stages layer male mammals materials membrane ment mesoderm micromeres molluscs moth neural plate normal embryos notochord number of chromosomes organs outer ovary pair parthenogenetic piece pigment plane pluteus polar bodies pole posterior present produce protoplasm regeneration region rotifers sea urchin sea water set free shown single sinistral species sperm spermatozoön spindle tadpole tail takes place testis tetraploid tion Triton trochophore tube twins type of cleavage ventral vesicle wall whole embryo yolk zoöl