Principles of Animal Biology |
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Page 15
... stage ; 3 , the four - cell stage ; 4 , the eight - cell stage . excretory orifice . ( Fig . 2. ) At the breeding season , when the eggs in the ovaries are ripe , it is possible to remove them from the body . If kept in clean water they ...
... stage ; 3 , the four - cell stage ; 4 , the eight - cell stage . excretory orifice . ( Fig . 2. ) At the breeding season , when the eggs in the ovaries are ripe , it is possible to remove them from the body . If kept in clean water they ...
Page 99
... stage exists in our own development . At an early stage the human embryo has pharyngeal clefts like those of a fish or tadpole , but they do not actually carry gill filaments . Later the truncus arteriosus becomes progressively. CH . V ...
... stage exists in our own development . At an early stage the human embryo has pharyngeal clefts like those of a fish or tadpole , but they do not actually carry gill filaments . Later the truncus arteriosus becomes progressively. CH . V ...
Page 111
... STAGES IN THE DEVELOPMENT OF THE MAMMAL A , Early cleavage stage . B and C , Separation of the embryonic area . D , Foetus with its membranes . the embryo at a certain stage has pharyngeal clefts , like those of tadpoles or fish ...
... STAGES IN THE DEVELOPMENT OF THE MAMMAL A , Early cleavage stage . B and C , Separation of the embryonic area . D , Foetus with its membranes . the embryo at a certain stage has pharyngeal clefts , like those of tadpoles or fish ...
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acid Amphibia anatomy animals Annelida appendages Arachnids arteries Arthropod behaviour biology birds blood body bones called capillary cavity cells characteristic characters ciliated Class colour crossed Crustacea Darwin dorsal double recessive Drosophila embryo epithelium evolutionary experiment experimental fact factors females fertilised fibres fishes fowl frog gametes ganglion Genera genes genetic gill glands gonads grey heart hereditable properties individuals inheritance insects Lamarckian land Vertebrates large number larvæ limbs Linnæus living matter lungs male Mammals mated melanophores Mendel microscopic Mollusca mouth muscle muscular mutant Natural Selection nerve notochord offspring organs oxygen pair of chromosomes parents phylum pigment plants principle purple receptor red-eyed reflex reptiles result scorpion segments side single skeleton skin skull species sperm stage stimulation striped muscle structure tadpole tion tissue toads Trilobites tube Unity of Type veins ventral Vertebrates vestigial walnut white-eyed wild type yolk yolk plug