The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 301
... appear to break at the points of crossing and to join up again in new arrangements ( lower row ) , but always so that each chromosome contains one of each kind of gene . I 0 : 0 Yellow 1 : 5 White -7.5. corresponding pairs . The ...
... appear to break at the points of crossing and to join up again in new arrangements ( lower row ) , but always so that each chromosome contains one of each kind of gene . I 0 : 0 Yellow 1 : 5 White -7.5. corresponding pairs . The ...
Página 315
... appear is imposed upon it from without by the mere accident of where the sperm makes its attack . In insects , however , the egg is already bilateral when laid . Here conditions within the mother's body decide all the embryo's future ...
... appear is imposed upon it from without by the mere accident of where the sperm makes its attack . In insects , however , the egg is already bilateral when laid . Here conditions within the mother's body decide all the embryo's future ...
Página 425
... appear in the record . Apparently the discipline of river life , with its currents to contend against , was bearing fruit and the vertebrate stock was already able to make successful sallies into the open sea . In structure and ...
... appear in the record . Apparently the discipline of river life , with its currents to contend against , was bearing fruit and the vertebrate stock was already able to make successful sallies into the open sea . In structure and ...
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