. Cell heredity. Cytogenetics. 204 CELL HEREDITY Cross Tetrads showing recombination in both intervals a b c a + c + b + + + + a 6 + a â Â¥ c + b c + + + a b c a + + + 6 + + + c a 6 + a + + + 6 c + + c Interpretation on (a) basis of breakage and reunion (b) Interpretation on basis of copy choice and sister- strand exchange FIGURE Genetic consequences of copy-choice recombination plus sister-strand exchange (from Pritchard, 1960, Microbial Genefics, Cambridge, The University Press).. FIGURE Diagrammatic representation of a linear model of a chromosome. The DNA particles (molecules?)
. Cell heredity. Cytogenetics. 204 CELL HEREDITY Cross Tetrads showing recombination in both intervals a b c a + c + b + + + + a 6 + a â Â¥ c + b c + + + a b c a + + + 6 + + + c a 6 + a + + + 6 c + + c Interpretation on (a) basis of breakage and reunion (b) Interpretation on basis of copy choice and sister- strand exchange FIGURE Genetic consequences of copy-choice recombination plus sister-strand exchange (from Pritchard, 1960, Microbial Genefics, Cambridge, The University Press).. FIGURE Diagrammatic representation of a linear model of a chromosome. The DNA particles (molecules?) are held together by links (protein?) which are assumed to provide great flexibility to the over-all structure, which can be stretched out, becom- ing virtually linear, or folded to form a ribbon. A genetic consequence is the possibility of two different kinds of ex- change, one occurring at the link points, and the other oc- curring within the DNA helix, as for instance, in Figure (after Freese, 1958, Cold Spring Harbor Symp. Quant. Biol., 23:13).. 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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