. Botany; principles and problems. Botany. 220 BOTANY: PRINCIPLES AND PROBLEMS dominant, the sixteen types will not all be visibly distinguishable, for the hybrids or heterozygous plants will resemble the pure dominants. The resulting F2 generation is shown in Fig. 125. Our expectation in such a population is evidently that nine- Parents PP 5S (Purple, Smooth) WW RR (White^Roush) Gametes. PW SR (Purple, Smooth) F; Game F2 (PWSRx PWSR) PS PR tWR PS iPR iws ZWR r^PPss / Purple,\ I Smooth) ,iPPSR V Smooth) re PWSS ( Purple, \ (smooth) re PWSR / Purple, N (Smooth) rePPSR /Purple s (Smooth) fePPRR
. Botany; principles and problems. Botany. 220 BOTANY: PRINCIPLES AND PROBLEMS dominant, the sixteen types will not all be visibly distinguishable, for the hybrids or heterozygous plants will resemble the pure dominants. The resulting F2 generation is shown in Fig. 125. Our expectation in such a population is evidently that nine- Parents PP 5S (Purple, Smooth) WW RR (White^Roush) Gametes. PW SR (Purple, Smooth) F; Game F2 (PWSRx PWSR) PS PR tWR PS iPR iws ZWR r^PPss / Purple,\ I Smooth) ,iPPSR V Smooth) re PWSS ( Purple, \ (smooth) re PWSR / Purple, N (Smooth) rePPSR /Purple s (Smooth) fePPRR ( Rough) re PWSR (Purple, X ISmooth/ riPWRR /Purple \ I Rough ) i PWSS / Purple, X (Smooth) re PWSR VSmoothj (White, N (Smooth) (Smoom/ fePWSR ( Purple, \ VSmoothj fePlVRR / Purple, \ V Rough J FsWWSR / White, \ ^Smooth) li WW RR / White, \ I Rough j' Total Fz 15 Purple Smooth) j^ Purple, Rough; 7^ White,Smooth^, 4 White, Rough Fig. 125.—Diagram showing genotype (in letters) and appearance of parents, of Fi, and of F2 in a cross between a purple-flowered, smooth-seeded pea and a white-flowered, rough-seeded one. sixteenths will show both dominant characters, three-sixteenths one dominant and one recessive, three-sixteenths the other com- bination of dominant and recessive, and one-sixteenth, both recessive characters. The results of another such dihybrid cross are shown in Fig. 126. The method by which new combi- nations of characters are secured through hybridization is thus clear; but we must remember that many of the F2 plants are. 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
