. The elements of genetics. Genetics. THE CYTOPLASM die. A few (too few to show in the diagram, Fig. 41) even contain plastids of both kinds and produce plants which are variegated already as seedlings. Evidently a white plastid never changes back to green. The same proportions of white and variegated seedlings occur in GG CC p F. Fig. 41.—The inheritance of variegation in barley, Hordeum vulgare, according to Imai (1928). Black circles arc green plants, white circles white plants, and hatched circles variegated. Size of circle indicates frequency of the type amongst seedlings. Superimposed on
. The elements of genetics. Genetics. THE CYTOPLASM die. A few (too few to show in the diagram, Fig. 41) even contain plastids of both kinds and produce plants which are variegated already as seedlings. Evidently a white plastid never changes back to green. The same proportions of white and variegated seedlings occur in GG CC p F. Fig. 41.—The inheritance of variegation in barley, Hordeum vulgare, according to Imai (1928). Black circles arc green plants, white circles white plants, and hatched circles variegated. Size of circle indicates frequency of the type amongst seedlings. Superimposed on mendelian segregation is the purely maternal inheritance of irrevocably white plastids in a small proportion of the progeny of mutating (variegated) plants whether selfed or crossed (after Darlington, 1944). the cross with pollen of a normal green barley as in the self of the variegated plant. The remaining plants from this cross, however, stay purely green instead of developing variegation at a later stage. Plastid mutation has been suppressed. The suppressor must be a dominant nuclear gene, because in the Fg a quarter of the plants are variegated like their grandparent. Mutation begins again with the 172. 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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