. Heredity in relation to evolution and animal breeding, . Heredity. HEEEDITY AND SEX In Drosophila the female is apparently homozygous as regards some cell-structure, X, which in the male is never represented more than once. Accordingly the formula of Female Male ^. Fig. 53. — Diagram of sex-limited inheritance when the female is a homozygote, as in the red-eyed Drosophila. X, sex- determiner; R, red-eyes. the female is in such cases X X; that of the male, X —. Now the sex-limited characters in Drosophila seem to be bound up with the X structure, not repelled by it, as is barring in fowls. Ac
. Heredity in relation to evolution and animal breeding, . Heredity. HEEEDITY AND SEX In Drosophila the female is apparently homozygous as regards some cell-structure, X, which in the male is never represented more than once. Accordingly the formula of Female Male ^. Fig. 53. — Diagram of sex-limited inheritance when the female is a homozygote, as in the red-eyed Drosophila. X, sex- determiner; R, red-eyes. the female is in such cases X X; that of the male, X —. Now the sex-limited characters in Drosophila seem to be bound up with the X structure, not repelled by it, as is barring in fowls. Accordingly, a sex-limited character may be represented twice in the female Droso- phila, but only once in the male; or in other 175. 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 Castle, William E. (William Ernest), 1867-1962. New York ; London : D. Appleton and Company
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