The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 161
... fertilized species will tend to supplant homogeneous self - fertilized species merely because they are variable . There will come to be more of the former . It is not that inbreeding is inherently bad and out- breeding inherently good ...
... fertilized species will tend to supplant homogeneous self - fertilized species merely because they are variable . There will come to be more of the former . It is not that inbreeding is inherently bad and out- breeding inherently good ...
Página 434
... fertilized egg - cell grows , as per rule , into the embryo ; the fertilized endosperm - cell grows into the endosperm or main reserve - material of the seed , destined to be used up later by the embryo . There is thus a double wedding ...
... fertilized egg - cell grows , as per rule , into the embryo ; the fertilized endosperm - cell grows into the endosperm or main reserve - material of the seed , destined to be used up later by the embryo . There is thus a double wedding ...
Página 699
... fertilized into females . Whether an egg shall be fertilized or no is controlled by the queen as she lays it . The queen , in bees and wasps as well as in ants , mates once only in her life during her " nuptial flight . " The population ...
... fertilized into females . Whether an egg shall be fertilized or no is controlled by the queen as she lays it . The queen , in bees and wasps as well as in ants , mates once only in her life during her " nuptial flight . " The population ...
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