. Cell heredity. Cytogenetics. GENETIC CONTROL OF CELL INTEGRATION 349 The relation between genetic determination of antigenicity and cyto- plasmic determination of expression is shown graphically in Figure Mating was carried out between animals of one stock grown at 25° C and therefore expressing their G antigen, and the other stock, grown at 29° C, expressing the D antigen. After conjugation, all F, animals whose cytoplasm came from a G parent, contained a mixture of 60G and 90G; Parents Fj animals after 5 fissions Fi animals finally at 25°C 90G + 60G 90G + 60G 90 D + 60 D 90D + 60D.
. Cell heredity. Cytogenetics. GENETIC CONTROL OF CELL INTEGRATION 349 The relation between genetic determination of antigenicity and cyto- plasmic determination of expression is shown graphically in Figure Mating was carried out between animals of one stock grown at 25° C and therefore expressing their G antigen, and the other stock, grown at 29° C, expressing the D antigen. After conjugation, all F, animals whose cytoplasm came from a G parent, contained a mixture of 60G and 90G; Parents Fj animals after 5 fissions Fi animals finally at 25°C 90G + 60G 90G + 60G 90 D + 60 D 90D + 60D. 90G + 60G 90 D + 60 D Fj animals finally at 29°C G & D refer to expressed antigens. d, g, s refer to gene loci, with unexpressed genes in parentheses. FIGURE Inheritance of antigenicity in Paramecium. In a cross between animals of strain 90 grown at 25° C (and therefore expressing their g gene, 90G) and animals of strain 60 grown at 29° C (expressing their d gene, 60D) the Fj progeny express antigens from both parents, and are therefore 60 + 90. Initially, the progeny inheriting cytoplasm from the G parent, are 60G + 90G while those from the D parent are 60D + 90D. Subsequently, all Fj animals revert to the state deter- mined by the temperature at which they are being kept (from Beale, 1954, The Genetics of Paramecium Aurelia, Cambridge, The University Press).. 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 Sager, Ruth; Ryan, Francis J. (Francis Joseph), 1916-. New York, Wiley
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