. The elements of genetics. Genetics. S S?xEcJ [S]xEc^ E Fig. 2.—Larvae of sea urchins: S, Sphaerechinus granuhtus; E, Echinus microtuber- culatus; S $ x E (^ , the normal cross; [S] X E (^, the haploid larva produced by the same cross when the nucleus of the egg has been removed. The larva is then scarcely anything other than a dwarf edition of the sperm parent which is the source of its nuclei (after Boveri i{ where they differ sufficiently, the characters of father and mother in equal measure. Going a step further, Boveri was able to fertilize a piece of egg, lacking a nucleus, of one speci
. The elements of genetics. Genetics. S S?xEcJ [S]xEc^ E Fig. 2.—Larvae of sea urchins: S, Sphaerechinus granuhtus; E, Echinus microtuber- culatus; S $ x E (^ , the normal cross; [S] X E (^, the haploid larva produced by the same cross when the nucleus of the egg has been removed. The larva is then scarcely anything other than a dwarf edition of the sperm parent which is the source of its nuclei (after Boveri i{ where they differ sufficiently, the characters of father and mother in equal measure. Going a step further, Boveri was able to fertilize a piece of egg, lacking a nucleus, of one species of sea urchin with the sperm of another. The resulting larva (termed a merogon) closely resembled a dwarf of its male parent from which it had derived its nuclei and showed no obvious influence of its female parent from which it had derived its cytoplasm (Fig. 2). We thus see the overriding action of the nucleus. The study of its structure and movements may therefore be expected to tell us why individuals are so constant within themselves in their inborn character and also why they differ from one another. 18. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darlington, C. D. (Cyril Dean), 1903-; Mather, Kenneth. New York : Macmillan
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