The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 273
... egg , the female gamete , is almost invariably a large cell . Even the smallest eggs , such as those of placental mammals , are large as cells go . The human ovum is almost a thousand times the bulk of an average human tissue - cell . Most ...
... egg , the female gamete , is almost invariably a large cell . Even the smallest eggs , such as those of placental mammals , are large as cells go . The human ovum is almost a thousand times the bulk of an average human tissue - cell . Most ...
Página 284
... eggs are haploid . § 3 Fertilization We turn now to the next stage in the repro- ductive rhythm - the conjugation of sperm with ovum . What exactly happens when the gametes unite to form a zygote ? Let us study the process in the sea ...
... eggs are haploid . § 3 Fertilization We turn now to the next stage in the repro- ductive rhythm - the conjugation of sperm with ovum . What exactly happens when the gametes unite to form a zygote ? Let us study the process in the sea ...
Página 699
... egg . The eggs of these social insects are unique in the animal kingdom , for they will develop equally well whether fertilized or no ; they can be parthenogetic , but do not need to be . Unfertilized eggs always turn into males ...
... egg . The eggs of these social insects are unique in the animal kingdom , for they will develop equally well whether fertilized or no ; they can be parthenogetic , but do not need to be . Unfertilized eggs always turn into males ...
Índice
THE RANGE NATURE AND STUDY OF LIVING THINGS | 3 |
66 | 5 |
muscles and related | 8 |
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Términos y frases comunes
active algæ animals arthropods bacteria become birds blood body bones brain branches called capillaries carbon carbon dioxide cells Cenozoic changes chemical chromosomes colour creatures crustaceans digestive Echinoderms eggs elaborate embryo Eocene Everyman evolution example eyes fact female fertilized fish flatworms flowers fluid forms fossils gametes genes germ-plasm glands grow growth heart human Ichthyosaurs important individual insects intestine kidneys kinds land larvæ layer less limbs liver living things lobster lungs male mammals marsupials matter means ment microscopic million molluscs mouse mouth movements muscles mutations nervous system normal notochord Obelia organs ovary ovum oxygen pair parasitic phylum plants polyps produced proteins prothallus protozoa reproduction reptiles round secretion sense-organs sexual shell skeleton skin species spermatozoa sperms spores stage starfish stomach structure substances surface swim tail teeth thyroid tiny tion tissue to-day tube types variations various vertebrates whole worms