Embryology and Genetics
Development 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.
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Development and Genetics
The Egg and the Spermatozoon
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adult stages amphioxus animals annelid antipolar antipole appear archenteron ascidian become birds blastoderm blastomeres blastopore blastula changes character chemical chromo crescent cut surface determined dextral differentiation diploid divide division dorsal early ectoderm egg nucleus embryo embryology endoderm 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 kind known larvae later stages layer male mammals materials membrane ment mesoderm micromeres neural plate notochord number of chromosomes organs outer ovary oviduct pair parthenogenetic pass piece pigment pluteus polar bodies pole posterior present problem produce protoplasm regeneration region right angles rotifers sea urchin sea water set free set of chromosomes shown side single species sperm cells spermatozoon spindle tadpole tail takes place testis tetraploid tion Triton tube twins ventral vesicle wall whole embryo yolk