. Botany; principles and problems. Botany. 216 BOTANY: PRINCIPLES AND PROBLEMS Fi hyl)ri(l, though only the purple expresses itself visibly in the plant. Out of this purple hybrid, when self-fertilized, come some perfectly pure white plants which exhibit no trace of purple in their descendants and some purples which exhibit no trace of white, Parents PP (Purple) WW (White) Gametes. All^V F, F| Gametes PW (Purple) -^p iw Fz (PWxPw) ipp (Purple) ipw (Purple) (Purple) (While) Fig. 124.—Diagram showing genotype (in letters), and appearance, of parents of the Fi, and of the F-i in a cross between a
. Botany; principles and problems. Botany. 216 BOTANY: PRINCIPLES AND PROBLEMS Fi hyl)ri(l, though only the purple expresses itself visibly in the plant. Out of this purple hybrid, when self-fertilized, come some perfectly pure white plants which exhibit no trace of purple in their descendants and some purples which exhibit no trace of white, Parents PP (Purple) WW (White) Gametes. All^V F, F| Gametes PW (Purple) -^p iw Fz (PWxPw) ipp (Purple) ipw (Purple) (Purple) (While) Fig. 124.—Diagram showing genotype (in letters), and appearance, of parents of the Fi, and of the F-i in a cross between a purple-flowered and a white-flowered thus proving that the factors for these characters, which for a generation have been existing together in every cell of the hybrid plant, have now (in one-half of the individuals) become com- pletely separated and have not produced the slightest effect on one another. carry the factor for purple and half for white, and that none are ''light purple". In the second hybrid generation or F2, derived by self-fertilization of the F\, about one fourth of the plants are purple, with all their gametes carrying the factor for purple; one half light purple, with about half their gametes carrying purple and half white; and one fourth white, all their gametes carrying white. The purple-flowered plants breed true to purple in the F3, the white-flowered ones to white, and the light purple ones behave as did the light purple Fi, producing about one fourth purple, one half light purple, and one fourth 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
