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The cultivated gerbera daisy (Gerbera hybrida (G. jamesonii Bolus ex Adlam × G. viridifolia Schultz-Bip)) produces fl owers that have either a dark (shades of dark brown, brown-black, black-purple, or black) or light (shades of green-yellow, yellow-green, or light yellow) central disk. The dark-centered varieties have increased in popularity over the past 20 years and provided an exciting color contrast, especially in white, yellow, and various pastel-colored fl owers. The objective of this investigation was to determine the mode of inheritance of disk color in gerberas. A series of crosses were made to produce P A , P B , F 1 , F 2 , BC 1A , and BC 1B progeny to complete the Mendelian genetic analysis. Phenotypic segregation ratios indicated that dark disk color was determined by a single dominant gene, designated Dc, and the light disk color by a recessive gene, dc. Dominance appeared to be complete in that the disk color was similar in both homozygous and heterozygous Dc plants. Cultivated gerbera daisies are diploids

Dark Disk Color in the Flower of Gerbera hybrida is Determined by a Dominant Gene, Dc